I don't think anyone sells complete kits. What parts are you looking for? Basically what you need are the water cooled manifolds unless it's something like a drag jet boat. Brass freeze plugs, water pump that's okay for water-only, marine type starter, alternator, carb, distributor. Flywheel, old bell housing or a plate to mount your starter to and the coupler that mounts on your flywheel to accept you drive's input shaft.