Before you replace an engine, make sure that you really have a problem. Sounds like you are buning some oil. but replacing the engine is not the first thing you should do.

See how much oil you continue to burn. I'm not a fan of "magic oils" but some people claim that AutoRX will help with rings. If I was faced with the prospect of an engine rebuild, I'd give it a try.

Actually a long block includes the head. What carMEAD described in a short block.