If its an original Raker and its a 23 pitch then the prop has been re-pitched because original Rakers only came in even numbers. They had a 20 and 22 that was 13 spline for a small gear-case 22,24,26,28 that was 15 spline for larger gear-case. So if you ever run across a 22 original Raker you need to count the splines because if its 13 it won't work on your 150. You need a 15 spline 22 for your 150.
It is possible but I highly doubt there is very many new in the box Rakers out there. They have not been in production for several years. They started making Raker II early 2000s (03?) and still make them today. Although it can be used on any motor with the correct hardware it was designed with the Evinrude E-Tec in mind. The Raker HO is the current "new" Raker style prop and like most any prop with proper hardware it can be ran on your motor but the Raker HO was designed with the Evinrude G2 in mind. The original Raker is three generations old. It was designed when carburetor motors was the current technology. This is why I say having a new in the box Raker is possible but why would one be sitting on a shelf for so many years because they have not been in production for quite sometime. I bet its a Raker II. Now they do make a Raker II in a odd number pitch but only a 25 not 23. Raker II's come 22,24,25,26,28...Raker even only, Raker II odd pitch but only in 25 the rest are even number.
Now with all that being said I know I have help you with hardware for the Renegade and I have not wavered from the Renegade on the other post but I feel this post is appropriate to give my opinion about a Raker and Tempest since its been mentioned...in the late 80's all the way thru the late 90's I would bet 50% of 18 ft boats with a Johnson or Evinrude 150 or 175 was rigged with an original 24 Raker. There is probably thousands of those combos around so yes its a proven combo that works. Now a popular alternative I often hear is The Renegade, which you are currently trying. Another good option is a 23 Tempest. You can run a Mercury prop on a Johnson/Evinrude with proper hardware. The 23 Tempest is a known good prop for 18 ft 150/175 bass boat combo.
I would not worry about buying new. I would seek a used 24 Raker (not Raker II or Raker HO but Raker) because the Raker II and HO is more so made for direct injection motors and your motor is a carburetor motor and the Raker was designed for your era motor. Anyways find a used 24 Raker and don't worry about condition. In fact if it shows wear you can get it cheaper. I would shy away from harsh damage but would still consider light damage if the price is right. If the prop looks a little rough and the price is right jump on it. DO NOT have them ship it to you. Don't even worry about testing the prop. I would have it shipped to Mark Croxten and have him repair it. Look on his web-page at before and after pictures. He can fix a damaged prop and make a worn prop run like a new prop. He calls it a repair when you fill out a work order but in reality its a refurbish because he puts all blades back into factory specifications. There is prop guys and then there is THE PROP GUY and I can assure you Mark Croxten is THE prop guy. Just do some research here on BBC using his name and you will see how highly recommended he is. Anyways buy used have them send it to Mark for a repair and have Mark ship it to you. When you get the prop it will look and preform like a new one. If you run across the right deal you can find a 24 Raker for 150-175 if your patient and lucky. Mark's repair service is $165, shipping both ways about 30 ish so you can have a like new 24 Raker for under 400 bones. Nothing wrong with the Renegade Bass your going to test spin but a 18 ft bass boat with 150 HP and a 24 Raker goes together like peanut-butter and jelly...its just a proven good combo.
Marks website...
http://www.marksprops.com/services.php
Now on the technical side if you have a jack-plate set the prop to pad at 3.5". Just make sure you keep an eye on water pressure because playing with motor height can effect water pressure. Anyways if all is healthy ie: boat not water logged and motor preforming 100% a 6" jack-plate set at 3.5" with 150 HP and a 24 Raker should get closed to 5600 rpm and 61 mph + or - a small amount.