318 Poly in an Early A Body?

It's not whether a Poly is a worthwhile engine, and it will probably fit with some hammering and modification. Just like a 727 in a early A. It will fit with some hammering and modification. A few have done it before. If the OP has to ask, he probably shouldn't attempt it. If you have to ask, it's probably above your head. It just doesn't make good sense. If you like the Poly (I think they are cool too) you would be better off finding a early 60's B body. The poly's came in those. They fit.