I dont think you can go wrong with a NOS brand kit super powershot system 75-150 hp.You are probably going to run a plate system i suppose?Probably under 400 bucks(i am guessing i havent priced them lately)
I ran this kit on my jet boat that had a bbf 429 i ran the 100 hp setting it gave me about 3-400 more rpm and 7 mph was a simple install and was still safe on the motor (stock internals)I was spinning it to 5600-5700 rpm before pump blueprint then it went to 52-5300 same speed.
I say go for it