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Sounds like you have carter carbs yes? If so the low vac. is not keeping the needles in the seats, thus very rich. I would check how big that cam is and where it's degree in at, sounds like a 110• or lower centerline.
I just went through changing the springs on the metering rods on the edelbrock's/afb's (750's) on mine.
It took changing to the blue springs (weakest) on mine to get them to stay closed at idle.
It will now idles fine in gear at 700 rpm and it quit gas fouling the plugs. Installing an MSD-6 AL2 helped alot with the idle too.
Kayse can't keep up at all now. lol
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