Installing small cam in Stroker?

I was up at the flash light drags today, it is held at the local airport.
An old guy walking with a cane had a super sweet 67? Chevelle, super clean street car.
He backed over to the AV-gas pump 110 low-lead and filled up.
The car had two gas fill necks behind the license plate.
When he lifted the hood, big block, nitrous, there was a valve, to switch between race and street gas. Pretty cool set up.
FYI 110 was $5.75 a gallon.