Vintage NASCAR would be 10x15 wheels with about a 70-series profile tire with 10" of tread width.
As for the 17" setup, I can't help there, but I've seen a 305/50R15 tire in a stock-height '69 Roadrunner and it cleared fine. The rims appeared to be 9" or 10" wide; they looked wider than the 8x15s (& 295/50R15s) on my '68.