Someone here might elaborate on this more about spark plugs.
One thing I did do to the 1975 this past winter was a trick I learned in a Scott Atwater manual to the NGK spark plugs I had in it. It was called old timers tricks in a manual written in 1950. 1 trick that I applied was this Champion would call their plugs like J6J or J6C the J at the end meant the side electrode was ground half-way back to where it was only covering half way over the center electrode making the fire jump in a sideways motion. I filed my NGK plugs to that patern and it seemed to help at idle making plug less likely to foul.
The other old timer trick was to mark the spark plug where the insulator curved tip is on outside of plug and when you install plug make sure the mark is in the down position even if you have to put in a second washer this helps a cylinder that is fouling. It also mentioned widening the plug gap on that cylinder also a tad.
Just something to ponder,
Joe
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