>>28504392
>Some heavy-duty inboard boat engines are actually quite similar to those found in industrial generator sets, haulers, armored vehicles and such.
80% of consumer inboards from wakeboats to big cabin cruisers are just Chevy or Ford small blocks.
>>28504561
>You would have to have at least one 90 degree gearbox no matter what as you have the main shaft coming from
Not if you laid the stripped powerhead down in a typical automotive configuration with the crank horizontal. As stated, you'd need to rework pretty much everything oil and coolant related to do that though.