For the head light problem. I would start with grounding the headlight plug to the car and not the wiring harness. Then I would try changing out the dimmer switch. If that does not work i would disconnect the light senser for the headlights.
It was a an under rated car, But the maverick grabber with a 302, 4 speed and 372 gears was a fast car and turned a lot of head. I had one back when they wree new and had a lot of fun with that car.
I always wonder how a bike built that low would look. I like it. Can noy wait to see the finish bike and you setting on it.
I'm big too and have been thinking of building a low bike.
Is the steering box behind the a arms If so its a 1967-69 Camaro or 1968-74 Nova. If the box is in front is a 70 or later Camaro
the 1967-69 Camaro and 1968-74 Nove are basically the same sub frame
That crown vic suspension looks like a real nice setup. Never though about using one but now you got me thinking. Would you happen to know the track width of that setup.
We use to run the purple stuff 100% in the race car with no issues. also used it in my car on the street at the end of the season and never had any issues. Back in the 70's you could buy 100 oct at the pump