Picked up a 318 streetmaster for the 273, good or bad?

If it doesn't leak, and the ports line up, pretty much anything aftermarket would be an improvement over a stock 2bbl intake...performance wise. I think there were 2 LD4Bs in the classifieds just a couple days ago.

Believe it or not, a stock 340 4bbl intake is a pretty decent piece, minus the weight...but since you already have the new one...