From my perspective, it gets down to what you want and why. If your intention is to put a 460 label on the fender so that everyone knows you have the baddest motor, then put it in there. If you just want to have a lot of power for the street, I would build a strong small block. The big motor weighs a lot more and there are lots of negative considerations around excess weight(and size) in the front of the car. You can easily get 300 to 400 hp out of a very streetable small block without and the project will cost you a lot less than messing with big block parts (they are all more costly). If this is your first engine swap, smaller and lighter is better.