Some years back, I got a two-shiv pulley for SBC from J.C. Whitney. I believe it was 10% smaller for the A/C application. It was for the stock, short-water pump configuration. It was chrome. No black offered. I suppose if you found one in some other catalogue you could prep and paint it black. Maybe Summit has them. I believe JCW is no longer in business.
Thanks but Looking for OEM pulleys only.