This is the great FB group for street legal race cars..worth a look if nothing else to share a common interest and post what your looking for. If I had the $$$, I would love to have an older sprint /silver crown street legal car as well!!
https://www.facebook.com/groups/1818046445088846/ or type: Street Legal Oval Track Cars 2 in FB search box

Good Luck..Hope you find a nice one!