Bryan,
The AC Delco spark plugs are the replacement for the AC brand. You can use resistor plugs or resistor wires, but not both. The truck will run with both, but the combination will raise the firing voltage slightly and will reduce the spark current quite a bit, which will appear to result in short spark plug life. But there really won't be anything wrong with the spark plugs. If you don't have a radio in the truck, the metallic wires and standard (non-resistor) plugs will be fine, but your truck will cause noise in radios and television sets when you drive past them. But realistically, I don't think anyone will notice.
As for the points, ventilated points have a larger moving contact that has a hole in the center to provide air flow and cooling. That feature is supposed to make the points last longer, but I don't know how effective it is. The idea sounds good, though. Heavy duty points have larger contacts and maybe a wider breaker arm for better heat dissipation from the contacts. They are intended for vehicles that operate at low speeds, with a lot of engine idling. Heavy duty points will last somewhat longer, but they are not for high speed- no racing with them, because they will start bouncing and floating at high speed and will result in ignition misfires. But I'm sure you won't be driving your truck that fast. The standard points probably have the 'standard' size contacts, not ventilated, and maybe a narrower breaker arm than the heavy duty version. The ventilated points usually have a larger breaker arm because of the larger contact, but there isn't much difference there. For your application, I don't think there is a compelling advantage of one type over the others, although I seem to remember seeing ventilated points that erode and transfer metal more than non-ventilated types, but there are several variables there, so I would hesitate to advise against using them. NAPA points are good products.
I prefer the brass/bronze cap contacts, but aluminum is alright as well.
Harvester
