This 427 inch small block weighs 449 lbs with a super heavy 340 resto block. A stock block engine would be another 50 lbs lighter. It has the same power curve as an early Viper engine. It costs roughly the same to build a stroker small block as it does to build a stroker big block. A 451 or 471 big block will make a little more power than than a 427 inch SB, but the SB will weigh less and take up less space.

I'd go SB or Gen3 in an A body car these days. I don't see any reason to put a big block into a street driven A-body anymore. It was great idea 30 years ago but these days there are better options.