I can not answer your question, but I had the pleasure of working on (tuned up, electronic ignition kit, changed fluids and detailed) a 70RR 383, bench seat 4 spd car and driving it around for a few days when I was in college. I'd swear that your handle is the handle for a bench seat car. I spent a lot of time making the one in that RR shine.

Of note, the car had kind of been abominated. Was originally white, but had a super thick, wavy, orange peeled and clear coated Earl Scheib silver paint job with enough flake in it that you could hide it in a parking lot of bass boats on trailers. It had a funky dark purple velour cover over the front seat and was packed with stereo equipment and all that entailed. Late 80's though, so it least it wasn't shackled up. Was this semi-retired (heh heh) truck driver dude's pride and joy. Was sweet and in great shape, apart from the above.