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

4. This:

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.