Which body for best performance?

I'm aware of the b bodies being offered both ways, sorry if I mislead.

I'm really wanting an aluminum headed 470 low deck in an A body. I think a 67-69 2 door post valiant would be the hot ticket. It just has that look I like and it's a great platform. Unless I come across a cherry not back barracuda for a decent price. Especially one with a vinyl top.

Anyway, thanks for the help.