Ignition problem: starts and runs in neutral but dies off in park

Okay - I got under the car and re-adjusted the shift linkage, then put my old Edelbrock 1406 carb back on (to rule out carb issues, although the Holley I had on there was fine on the run stand).

Now, although it still won't start in park, it is idling in both neutral and park with no problem. I still am losing voltage somewhere - showing 12.3 on the battery and 11.6 coming out of the ballast resistor clip (not ballast itself). Ammeter settled back to normal while idling.

Initial timing is about 14 BTC. Idle is having trouble staying even below 800, and certainly cannot put it into gear. I have it up even further to keep it from stalling when I put it in gear (950 or so).

Other information: the torque converter is a factory high stall. AJ - what you wrote intrigues me. How are torque issues diagnosed and resolved?

Perhaps a dumb question: what is a T-port/T-port sync?