I am buying a 99 bass cat Pantera 3 with a 99 mrec 200 efi 2.5L
1 how good are these motors on fuel at wot and half throttle?
2 Is there anything special I need to be aware of with this motor?
3 The person that had it before the guy I am buying it from blew the power head had it rebuilt and now has 150-175 hrs on it but when it got rebuilt he took off the oil pump and just mixes the oil what ratio do I need to mix it at and what kind of oil do I need to use?
4 How hard and how much would it cost to put the oil pump back in it and a oil tank or do I just need to leave it as is?
5 I have a oil tank from my previous boat that had a 86 150 blackmax xr2 magnum would it work if I decide to put the oil injection back on?
6 Do I need to run stabil or something else for ethanol protection? On my motor I have now I have never used stabil but once and it screwed it up so I quit using it.
7 what size prop do I need to run it has a 4 blade on it now but I would think a 3 blade would give me better hole shot and a little bit more top end please correct my thinking if it is incorrect.
8 anything else I need to be aware of

Thanks for any and or all help in advance