I've been down that road more than once, on your deal with that motor combination in my A body cars liked the Hooker A body fenderwell headers with the 2.0-inch primary pipes with 3.5 inch or larger collectors for all out drag racing better than the 1 7/8 inch set with the same collector size: up:
You know you're going to want to make more power later so build the big pipe set now and not have to do it over later