wiring up Proform Mopar HEI Distributor # 440-434

71 should have 2 terminal ballast? Or was it converted to 4 pin?

A 2 pin you just hook both terminals together. Then use the original coil+ wire to feed the HEI. The HEI should have a "tach" terminal there in the cap

If you have a 4 pin ballast, 2 of them are jumpered together. The wire(s) the jumpered ones connect to is your "run." One of the remaining 2 goes to the old ECU, so that is disconnected. The remaining one has the IGN2 "bypass" incorporated, so jumper that to the 1st one I mentioned the one with the "jumper" and then hook the old coil wire to the HEI power