Should I buy these?

I have a 72 Dart with a 318 and I'm planning on ditching the cobbled together exhaust for a nice dual exhaust. Ive thought about upgrading to different manifolds but these are so cheap that it almost wouldn't make sense to go buy manifolds. I know the drawbacks with headers, but what do you guys think?

http://www.summitracing.com/parts/sum-g9040