I am not coming up with anything on that number. It could actually be 3948103 YB or 3848103 YB. I did not find it for the Chevrolet lineup from 1977 and older. It may be a newer model pulley?
Team Camaro Gold Member #14
1967 Camaro RS/z28 - one of 602 made - SOLD
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1969 Camaro RS/SS L48 4 speed
1974 Camaro LT-Z/28 4 speed 33K orig miles
1979 Camaro Z/28 36K orig miles
1987 Monte Carlo SS 25K orig mi bought new by me.