FWIW, I had the first gen Firebird front fender script copied for one of the Pontiac shirts my wife and I used to sell. Any graphic artist that knows what he's doing can easily make you a decal with a sample of the script.
See example below:
The shop I used made metal signs, decals, and T shirts. The guy that did the graphic designs never let me down when I asked him to execute the ideas I had. He was able to take my ideas, and rough sketches, and transform it into a T shirt design.
I also had the Stratostreak script taken from the 1955-1957 V8 valve covers:
And we also made it into a T Shirt, see below:
Since I wanted the area all the way across all the t's in a solid bar, he used a small s in streak so the arrowhead emblem looks as it came out to the cross bar like a small rocket, further going with the rocket inspired name Pontiac used for their original V8 engine. I also wanted it to look like a neon sign, and I think he got the effect I wanted. The neon sign look was much harder to accmplish than just getting the scrpt right. He had to use a matrix pattern of tiny dots to achieve the neon effect.
Here is the Pontiac Indianhead also made to look as it is a neon sign:
And the GTO script, also neon sign influenced:
A good graphic artist can make almost anything you want/need.
I hope this information is of some use to you.