273 rebuild

I would say the key words are "cheapest" and "done right." Be prepared to spend at least a couple thousand. At least. If everything inside is close to specs you may be able to just hone the block and freshen it up with new rings bearings and gaskets. You can grind the valves too and call it good. But, you get what you get. When I rebuilt mine, there was too many thing worn out so most everything got machined or replaced. You will have to be the judge as to how much money to spend depending on what the engine needs. Mike