Cam upgrade for my truck, '72 D200 with a 360

MopaR&D said

I get the feeling you aren't too familiar messing with trucks, (for towing and hauling, not "hot rod/muscle" trucks) as opposed to cars.

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I guess I missed the towing/hauling part ......
on a sidenote;
I've never had a vehicle in over 50 years that was prone to "pinging". Almost every carburated car I have ever had was a Mopar tho; including my 1975 D100/318 ........... and almost every one of those was an SBM. I say almost every one, because there was this one exception, lol, a 1984Hyundai-Pony; but it burned anything, I mean absolutely anything, including several years old stale gas with a high percentage of diesel in it.
But you are right; I know nothing about towing/hauling, and had no idea that 33s were used for that with 3.55s.
Sorry I cluttered up your thread.