I am buying this motor from a friend but needs a crank, pistons, rods and bearings. heads are complete. I dont want to buy the wrong stuff for this motor, so I am seeking a little help on finding what I need. I am looking to keep cost down of course, but not wanting used crap. I would be nice to find all that I need in one package. I am just worried that I might buy the wrong crap, cause I need stuff for a 4 bolt main.