Where's the Wow?

OP, do you still have that same crank sprocket? Using the slot with the triangular 'roof' should be for +4 degrees cam timing.

Interesting on the damper. (I did not expect that from you initial report.)

Please take the time to verify the ICL with the degree wheel.

If it is all on time, it is back to the ignition timing, TC and the low SCR..... Am I understanding it right that this is an untouched 1974 bottom end....43 years old?