I ran my car with a stock 300hp crate magnum with a stock TQ lockup circuit plugged 12.70s
67 Dart 3200 lbs
904 lockup/ low gear set, TF-2 shift kit, 3.91, 27 tire
I then home ported heads, installed 234@050 lunati hyd roller, china airgap, and bought a Turbo Action S-800 10" tight converter. Drive 50 miles to track, run it and go home. Car ran 11.9 in good air @ sea level. I ran this with the lockup input shaft, approx 400 hp, over 300 passes no issues.