Interesting idea. How about things like motor mount and outboard? Would that all match or need work/be replaced?
Is there an specific engine I should be looking for?
Interesting idea - which the upgrade or using a wrecking yard engine?
Any of these get a 96 and up vortec chevy truck engine.
the 4.3 was developed by taking a 350/5.7 sbc and cutting out two middle cylinders. the front and back of the blocks are the same (except for metric 4.3 090M casting bolt threads are metric), the engine is about 4" longer. So side motor mounts and engine front are 4-5 inches farther forward. If your boat was offered like mine with both 4.3 and V8 engines from factory likely it will easily fit.
On my 200 sport the engine mounting stringers were about 12" long so the side mounts side front or rear of stringer depending on if it 4.3 or V8. The engine compartment had enough space in front. The flywheel cover, starter, wiring harness, fuel pump, distributor (need to change trigger wheel and cap and ignition module), accessories etc all swapped over. I kept the V6 outdrive (gearing is different between engine sizes) and stepped up 2" in prop pitch
Would not recommend it if you have to modify the boat..
If you are talking about the wrecking yard 4.3 - as Bondo states strip it to the long block, put in marine head gaskets, brass core plugs, marine circ pump and take all the accessories off your old engine and put them on the donor long block.
If you have done an engine in a car this is actually easier. As long as you have a lifting device- beam in a shop/chain fall, wrecker with a boom, or small crane the engine can be pulled in about an hour, 2 if you screw around...
