The engine was in alot of Ford fullsize trucks and vans. That being said. Some stuff wont interchange. The crank, rods, pistons, and block are the same. The cam, heads, valves, and ALL electrical parts are marine specific. Discount inboard marine
www.skidim.com is an excellent source for non-major parts. Just so you know, the distributor, alternator, carb, and starter are marine specific parts that MUST be replaced with marine units. I'd put what you have back together and try and run it on a water hose before i started throwing money at parts.