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I believe it can be from any Chevy small block 1970's- 1984. Check with a salvage yard in your area. You might check with your local NAPA store also. It would be 5 3/4" diameter. I think this pulley from Speedway would work.
http://www.speedwaymotors.com/Black-...evy,73979.html
If you call them I'm sure they could tell you.
Welcome from another Iowa member 60 miles West of you.
LockDoc