"" Big badass drag engine in my 67 GTX. Big stumble off idle, can't get it out adjusting pump.""

The 30cc pump cam sizes (largest to smallest VOLUME): Blue, Orange. Green, Pink, Red, White, Black.
Since the Blue has the Largest volume of the 30cc pump cams, give that one a shot on hole #1. Then if you need more, then you might have to test a 50cc pump assembly.

That Pink cam is the laziest of all of the pump cams off idle even though it is the fourth largest pump cam in volume. Blue and Orange are the most aggressive off idle and then Green and Red,