I would say you have some felxibility as most pics that I find show blackwalls,
Although on other pics of the same car I have seen BF Goodrich and Goodyear .
Really nice. I was thinking of building that same kit up as a TROG as well, and just picked the color recently, but yours is much more captivating of a color.
My first wife had one before we got married. Fun little car, until the motor blew. One winter, I am not sure if she had it low on anti-freeze r oil, but it certainly gave up the ghost. It was her first car, and she was young.