Tight converter consistency

I really appreciate all the help guys.

I know my converter is tight, is it possible to tune enough power out of it to raise the flash point several hundred RPM? The motor is not falling on its face.

I am not real interested in going much faster than I am right now because I want to run a 12.0 and slower bracket. I want to know how much more inconsistent will the tight converter be compared to the correct converter?
You may want to try taking some timing out of the engine and swap out the torsion bars for a set of /6 bars so the car transfers the weight to the rear of the car faster. An adjustable set of drag shocks in the rear would not hurt.