Thinking of buying a boat that needs an engine. I did this three years ago and made out pretty good on the deal. Sold that boat, now going bigger. Anyways, the boat has a mercruiser 5.7 efi with a bravo 3. The block is junk. Thinking about doing a new 350 but porting the heads and adding compression, and possibly different cam. I'm from the Drag racing world and have built many engines, mainly efi stuff but with aftermarket systems in which I would also do the tuning. I know if the efi is speed density (no mass air flow sensor) that usually the tune needs to be adjusted for any big changes to the engine. I know nothing about mercruisers efi. Is it speed density? Is there companies that program these? Thanks in advanced