The Chevelle is on Hot Rod Power Tour this week displayed in the Mothers Polish Booth.
See this thread for photos:
https://lateral-g.net/forums/showthread.php4?t=41553
Brian's 72 is a original SS car (expect for the black interior, should be white for a white striped car) with no body modifications. Meaning the fenders, rocker panels, fender lips, etc. have not been modified. We built the wheels on a conservative side as far as wheel and tire fitment. With rolling or cutting the big rear fender lips we could have squeezed an 11.0" wide wheel. We went with a 10.5" wide and kept the tire away for that original fender lip.
On the front you have a lot of room to the inside. You could go as wide as a 10.0" for track use and depending on your suspension set up. We kept it narrow with a 8.5" with a 245 tire. If we were to do it again I would recommend a 9.0" wide with a 255 tire.
One thing about these big Chevelle's is they make 18" wheels look small. I would recommend a 19" wheel and tire package. Better tire diameter selection in 19" compared to 18" and the overall finished look is better.
Good luck!