Perhaps I shouldn't post this, but perhaps there are YOUNG 'old' guys here who might have done this years ago if they could have and would now too. I did have dual flame throwers on a '39 Ford Coupe (w/o mufflers). This only cost $12. and was done in about 45 minutes. Works off the license plate light but could be switched for the timid !!! Purists hold the flack. I do have a T-Model coil somewhere so another flame thrower could be in the future??? lol 🙂
This is a string of eBay LEDs on inside of rear bumper.
EDIT: not sure if these are avail. in 6 volt.

haven't got any flack(or blackballed) yet so here is a photo of the LEDs inside the bumper. I doubled them so I could start at the license plate wire then came back to that point to stop{two strands on each side). Hardly drive at nite but will feel safer now.