Along with everything others here have suggested, I suggest to make sure the connections on the distributor cap are snapped in place and the wire crimps on the new terminals are tight. These wires would be the ones from the engine harness and from inside the cap to the four-prong connector on the driver side of the cap.
If this car has HEI, which by your description, it does, "LATCH", the power wire had to be changed from original wire. This original wire was/is a resistive wire from firewall connector on the other side of the brake master cylinder to the distributor. This wire had/has to be replaced with standard 12 gauge wire from the same point. Someone had to crimp/squeeze new terminals onto this wire. These are the ones I'm suggesting to check. Sometimes, a loose connection is made and another potential problem arises.
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