I had a short tube on the last distributor and i flattened the tang on both sides a little to make it a comfortable fit in the slot.
Going back to my original question, could the bush possibly cause a problem.

69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200#
best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft
best 60ft 1.36