Chris, I see you are in Tulsa, OK. I am assuming there is a hot rod/street rod club in the area. Get in touch with these guys and find out where they are getting the tire and wheel work done for the custom cars. The good shops specializing in custom wheel and tire fitment should have a wheel/tire fitment tool. The good tools look like some sort of calibrated cake mixer tool. This tool will allow the user to set rim width, back spacing, rim diameter, and then mount the tool on the hub. After all is set an actual tire is mounted in the tool and you can see first hand how it fits, or does not fit, all without actually purchasing a tire or wheel. When all this fitment is complete you will have information on exact wheel dimentions and exact tire dimentions to fit your vehicle. Good luck.