For my two wheel drive '82 F-150 I will be overhauling the 351W engine. What are the best factory heads to port? I am going to be running a six pinion planetary C4 with 35" tires.

 

For the money you're gonna spend on porting and valves you could have some Dart iron eagles that outflow any stock head ported right out to the water jackets. Some of the AFR and TFS aluminum heads are similarly priced, and even a pair of World Windsor Sr heads woul give you a hugh upgrade over stock.

 

RHS is the best value!