Pulling V.A at idle

crackedback said
JMO 12* initial with a 484 cam is not the best spot. That's factory 340 cam timing specs and they were light.

I'd put 18-20 on it and see how things work at idle.

Drilling a carb is always the last resort for me. Timing usually helps clean things up if inadequate.
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That's an old vid w/ the same engine, running points. The 340 is now electronic, in a Duster, pulled drivetrain, outta the 66 Sat, after my deceased wife wrecked it and bent the frame. Sorry for the muddy clarification! My Bad....