A gap of 0.045" is about right if you're running an HEI ignition. That might be a little wide if you still have points.
The 350 in my C-20 likes AC Delco, but the big block in my Nova likes NGK.
I just run regular plugs: no platinum, no multiple tips, no bull. I run MSD ignition boxes in everything and never found a need for anything more than regular spark plugs.
DJS
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