Not sure how close you are to one, but Riggs Brothers (Bros?) excels at things like this.
Backed by over 7 decades of experience!
www.riggsbros.com
And that is a niiiiiice ride. My dad used to have a 65 GTO, black over red with black interior. Came with the 2spd Powerglide and they upgraded it to rock crusher.
Another modification, one of his buddies used to work at an airplane parts supply house. So they shimmed in some landing lights in place of the hi-beams. Said it would throw out a football-shaped pattern and were so bright that in the middle of the night you could turn them on and read a newspaper 2-3 miles down the road. Couple of drawbacks. One, with them on if you go too close to the car in front of you, you could start to bubble the paint on the back of their car. Second, the voltage regulator was not cut out to handle that kind of load. Said they'd be cruising down the back roads in the middle of the night doing 100+ with the top ballooned up so far you could pass a basketball between the supports and the fabric and the entire electrical system would just shut down. No headlights, no dash lights, nothing. You never quite knew when they would cut out or come back on LOL