Did you ever datalog your running, driving vehicle? Did you ever test your timing light on that same vehicle? If I were you, I would narrow down a few possibilities. Test your timing light on the other vehicle with TunerPro connected to the ALDL stream. If it works as expected on your drivable vehicle, I would be suspicious of the aftermarket distributor. You could swap distributors and see if the problem follows the distributor.. Swap PCM's. See if the problem follows the PCM. Here is the first run of my 7427 TBI project. It was rich and overall ran like crap. This video shows the engine running with everything hot-wired and even used a jumper wire to start it. I had no switches, fuses or any kind of circuit protection.
https://www.youtube.com/watch?v=IoyPCrM0nR8 During the first 20 minutes of running it after adding an adhoc cooling system to it, It killed a set of plugs. When I connected a laptop to it, with it running, the BLM was bottomed out at 90. It had a very pronounced surge at steady throttle and the rpm fluctuated between 500 and 1100 RPM at idle. After some minor idle VE adjustments, It starts, idles and runs great. When I set the base timing to 0 deg and reset the PCM, I glanced at the timing.with a light with it running. I don't have a dial back timing light but it was in the area where 20 advanced would be. That reminds me, I need to acquire a timing tape. I have not touched the open throttle VE table yet because there is no need until I can get the thing out and drive it at highway speeds to get data at varying loads and speeds. Check some of these points mentioned above and post what you find.
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