'87 351 Ford parts equivalent?

[cadunkle]

Your points, condensor, cap and rotor are for whatever distributor you have. Probably a Mallory YL, but possibly a Prestolite. These are not automotive parts but many NAPA stores sell marine parts. Tell them the year and engine, '87 Ford 351w (Pleasurecraft) and the model number off the distributor and they should be able to find the parts for you.

Other parts like internal parts and such are all interchangeable with automotive. You should retain marine starter, alternator, distributor, and carb for all boats with a closed engine compartment particularly. Some guys run automotive parts but I don't think it's worth the risk. Also, water pump on the engine and head gaskets (if any metal in them) should be marine.