So, the consensus from the other Celica gearheads is that it's my igniter on the Supra. I have a few options:
1. Purchase an igniter from a vendor for roughly $400+
2. Hope a friend has one on the shelf in his garage for cheap
3. MSD + Tachometric relay
The only concern I have with #4 is that there has been issue with the '79 igniter because it's wired into the EFI system. I'm going to give it a shot though, rather try $35 in parts than $400.