Some things don't add up here. The "Half engine" part is a term I've never heard, and why would a GM crated up engine have two Holleys and Edelbrock valve covers? To me a half engine would be a short block, whereas this one sounds like a complete pan to carb(s) engine. Do two Holleys even fit on top of a Chevy small block? I know they do on the crossrams, but.........

Very easy way to solve this. Take pictures, lots of pictures. Take the crate, the writing on it, what you can see of the engine, etc. Then we have something to validate what you are saying. Not that I am doubting what you are saying, but you are kinda new around here and we haven't had a chance to get to know you yet.

Post up those pictures, we're anxious to see this motor and try to help ID it for you.

Don