Doing a lil' slow at work internet crack surfin' today..
It surely is easier to find GMC stuff.. not so much on the Chevrolets..
Spotted a couple fairly recent videos of one of our beloved topic H/J series cabs ..
No doubt.. a Detroit.
I'd say a good ole "318" by the smooth and even notes.
Obviously a GMC (not a Chevy) high cab..
If the driver would have stuck the launch instead of spinning the tires. ... he could have had it won.....