NHRA rollover rules for dummies - Am I good?

I'm about 90% in for a return in '19.  The car I'd be starting with started life as an SCCA road race car that suffered at the concrete of Road Atlanta.  But that's OK, I can deal with that part.  It has a very nice roadrace cage - 6 point welded in, good landing pads, lots of triangulation, great doorbars, 1.5" x .120" DOM.  It's solid.  But I also know that NHRA is funny about their cages.  And their rulebook kinda sucks.  

I'm fearful that this cage, stout as it is, is only good for the same 11.50 quarter mile that an uncaged car is.  Is that the case?  Is there any room for sanity, or is that hard and fast?

Measure again and see if it is not  1 5/8".

Basic rules and build

https://www.dragzine.com/project-cars/project-biting-the-bullitt/understanding-and-building-an-nhra-8-50-and-10-point-roll-cages/

It is definitely not 1 5/8".  Road racers build out of 1.5" or 1.75".  1-5/8" is a weird thing that drag racers only do.  Although, since I know it's safe, I'm not above mis-calibrating some digital calipers to make it read 1-5/8"....

The previous rulings have been that if your cage is scca legal than it will suffice to the rules for the challenge and surpassing 11.49.  

Woohoo!  Thanks.