Question on Cages

I had a buddy looking over my 'cuda and he seems to think my car won't pass tech with the current roll bar setup it has. I'll admit the roll bar is probably 20 years old, since that's how long it's been sitting in the barn. How much change has there been in 20 years? Anyone know the current IHRA specs on cage/roll bar installation? I have no way of measuring tube wall thickness.
The reason he said that is the fact that my 1/8" floor plates are not flat on the floor due to the curves in the floor. It looks like they welded small risers ( like a box shape) in the uneven areas to make it level. Also, on the trunk bars, they trimmed the floor plates for the spare tire well area. Last I knew the plates had to be 6" square min, 1/8" thick.