Thank you Robert for the help!
Unfortunately, things didn't go as planned. The Blackbird Fabworx GT3 bar is a nice piece for sure. My issue is that the harness bar sits to high for me, that's what happens when you're 6' 3" with a long torso.
My driver's seat is very close to the harness bar and since the seat is mounted very low, the seat holes for the shoulder straps are lower than the mounting bar.
I have two options here: (i) add lower harness bar to the current one, or (ii) get a new seat with higher and bigger should strap opening.
I'll stop by Lucas Racing and Restoration and chat with Greg about the path forward.
Currently the rollbar is just sitting in the car with couple of bolts holding it, no drilling was done today in case I ended up with option (iii): custom rollbar.