.620 mechanical Purple Shaft?

Garrett Ellison said
Is it the '67 Charger in your avatar and what's the tire size? Hot strip/street car or drag only?
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MOPAROFFICIAL said
Sure. I'd install it 6* advance.
Pay attention to the lash setting, cold .
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Which would be a better cam, the .620 purple shaft or this GK mushroom cam im thinking about too?Screenshot_20200809-095117.png