Spark plug gap

[Mayhem]

Since I can't get an answer from anyone on specifically what the gap should be, I am regapping them back to .040 where the old set was. I can't believe .005 would make such a huge difference.

At least I know how well it ran at that gap. I still welcome input for what it should be.

Again: 350 1980 Corvette engine (apparently an L82), aluminum heads/intake, 292/501 cam, 10.5:1, 50/50 mix of pump gas and 111 leaded fuel.
(apparently the vette engine part makes a difference in plugs from all other 350's-not sure why).

I will likely buy the MSD dial adjustable timing setup later to fine tune it for different variations and temps.

Thanks all.