Fish: I agree with Bushwacker:
" if you can get enough speed at an acceptable vacuum level with that combo"
The 5.7 with a duoprop(or bravo3) balances 0k in a 25, especially with a light load. Load it heavy and you need careful to put a lot of weight forward. The big block would definitely be worse for balance(important in the 25), but If you are looking for speed, you might consider a big block and moving the fuel tanks forward. Mine, with a 5.7 throttle body EFI, is a bit slower than I would like. Light load is fine, 24-26 knots cruise. Load it down, the vacuum drops fast and you have to slow down, 21 knots or there abouts. Fuel economy goes to hell as well. You might find a good solution in one of the higher horsepower small blocks with more modern EFI, not sure.
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