converting points to hei on a chevy 283

You need a straight 12 volts, into the HEI coil to work correctly. Every 1 volt in primary( before coil) , is possibly 5,000 volts secondary voltage (at the plug wire). The GM points cars, have a resistance wire , to the positive side of the coil. Trace that wire back to the bulkhead connector, replace it with a good 14/16 gauge copper wire. Let's start there. HEI based ignitions, love more voltage.