a 24 raker is going to be the way to go but you really need to lift the engine. I find it hard that a 284 did not come with one most came from the factory with it as standard equipt. you will also need to put in a water pressure gauge as you need to keep the pressure at no less than 18 lbs at wot ( wide open) best is in the low 20 lbs. getting a jack plate is the most important thing as the only thing you may do is lift the engine a hole on the transom but to do that it is the same as putting on a jack plate and a smaller pitch ( 22) prop will run ya the same price as a new 6" plate 2-300 dollars which would bring your rpms up but your hole shot may suffer and also your top end. 60 is a good speed for that boat as it is heavy ( dual console) as compared to a single console. it will not be a speed demon never happen unless you up the hp and such. sorry but 60 -62 mph is about the best you can do with the hp you have.