[oldskool]

I suppose one of the winningest Pontiac Stockers of this time period may have been the Don Gay A/S 421 car. I've already posted about it. But, there were LOTS of early '60's Pontiac Stockers.

Don't have a clue as to how long some of these cars may have continued to compete.

The only '60's big Pontiacs I remember competing in the '70's were wagons.

I suppose the A & F-bodies took over all the classes the big cars could run, so the big cars just couldn't compete.