My choice would be Hooker ceramic:
http://www.summitracing.com/parts/ho...del/c10-pickup

I put a set on two years ago on a '71 C10 that is parked outside in the Pacific Northwest weather and they still look really good.

I had 40 series Flowmasters with 2-1/2" pipe and dump just in front of the rear wheels with cut chrome tips (My son's choice - I like rear exit personally). Sounds great.

Some additional thoughts - use copper gaskets, and use Stage 8 stainless locking header bolts as well as stainless bolts at the collectors - I know they're expensive but this way you will only do this once.

My 2 cents,
Glenn