Yeah, it's been posted many times, on Pontiac forums, that the big cap HEI can not be used with a Tri-Power intake.
But there are lots of small cap options. Lots of guys like the Pertronix Ignitor points replacement system. It allows you to retain the factory look.
https://www.amazon.com/Pertronix-711.../dp/B002Q34NI4
https://www.amazon.com/Pertronix-711...ustomerReviews
If you don't care at all about the factory look, there are other options. Don't know your budget. A high end option is an MSD dist & coil.
https://www.ebay.com/p/Distributor-P...nid=1907933686
The Pertronix is cheaper.
https://www.ebay.com/p/Distributor-P...d=382667092584
This one has the Ignitor 3, with rev limiter. You can usually find a 25% online discount from Advance Auto.
https://shop.advanceautoparts.com/p/...tm_medium=ymme
https://www.ebay.com/p/Distributor-P...nid=1907933686
Even with tax, the Summit brand is a few bucks cheaper.
https://www.summitracing.com/parts/s...w/make/pontiac
Then there are the cheap Chinese Ebay models. Some are also listed with a coil, and some with wires. Don't know if any of these items are usable or not.
https://www.ebay.com/i/201830460321?...26pg%3D2385738