Did you ever try swapping the cam with a known good one to eliminate that variable? A lot of what you’ve found and said points to a bad distributor drive gear on the cam. As I see it; uneven distributor driven gear wear, odd distributor bushing wear, noise from the distributor area and distributor driveshaft whiteness marks. All points to the last variable in that area. . . Camshaft distributor drive gear.
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1967 GTO, 432 (428+.030), 4-bolt mains, factory Nodular crank, scat rods, icon dished pistons, Lunati HR 243/251@.050, .618/.622 lift, Edelbrock 72cc round port heads, 10.5:1, offy 2-4 intake, Edelbrock 650cfm carbs, Super T10 trans (2.64 first), BOP 10 bolt w/ Eaton posi and 3.36 gears
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