The BB has crappy valve placement so it can not take advantage of the big bore like it should, it also weighs #100 more plus asuming an auto trans you have to run the 727 instead of the 904 you can run with a 408 for more weight savings less drag and better 1st gear ratio option and is harder to do plugs and such, I would go SB 408.

I am not causing global warming, I am just trying to hold off a impending Ice Age!