Swampyankee; unless you're building a work truck that will have to run wide open under HEAVY loads day in, day out, use the intake and exhaust as they are. All the worry about "ports this" and "ports that" means very little unless you're racing. The work required and the lack of dependability on the street of "racing modified" parts makes almost no difference, unless it is to lower your usable RPMs and burn more gas. Do what you want, but I believe that the stock parts and a Carter YF from a 300 CID L6 F**D will give you the best bang for your buck.
Best wishes,
Les
