273 short block repair

We're just having fun, as soon as the OP gives us good info we'll get serious. It's like a friend calling you on the phone saying that his engine is making a funny noise, you ask " What kind of noise" and he says, "Clicka, clack, buzz, buzz, buzz"...then he asks you what part to replace.
I have had this type of question many times. Replace everything but the gas cap. Unless itmakes a whoosh,then replace it too.