recently my 4k has been having some wear & tear issues like piston rings wear, flywheel oil seal leaking. Thinking of upgrading to a 5k. Found a 5k that seems to be quite a deal however is is not complete. What parts can I use back from my 4k on this new 5k? Intake & exhaust manifold, distributor, engine mounting, alternator, starter, carburetor and a few other parts are not with the 5k, can I use 4k parts to put onto this newer 5k? Here are some pictures of the 5k and my current 4k.