I purchased a 350 motor and trans for $300. It came with a edelbrock intake and carter carb. The trans already have a shift kit in it. The owner said the piston was slapping the head( only on one piston). All the pistons are fitting very snug. He thought the bearing on that piston went bad. What would be the least expensive way to repair it and this will be my first rebuild. I don't want to replace all parts with new parts,just repair the engine. I am on a very strick budget.