You have a code, probably two large letters, next to the valve stem hole and that will tell you which rims you have and the backset. Some are worth alot because of one year production, like AG code 68 vette, but most are not that rare to command a high price.
Kelsey-hayes made them and a search for "Chevrolet Rally Wheel codes" will get you the code and prolly an idea of the value.
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