HP gains?

Yeah.......... tech is a problem. Had it at the track in late 2022 and was kind of surprised I got shut down. old guy said I ran too fast. "Buy an NHRA book". I'm not cutting up a real Demon 340 4 speed for a bar or bars. Maybe if it was a slant or 318 car but no way.
I do not condone what we do here locally, but track isn't that important. This area has a long, rich history of .......well....you know.

I have never understood why a car is “ cut up” if it has a roll bar in it.
They can be removed very easily. I also question anybody( not referring to you Iron Mike) who would drive around an A body making serious steam that would do so without frame connectors.
Unibody stuff doesn’t stay the same with serious power applied to it.