i have a pulley that was taken off my 69 rs ss 350 camaro . it is single groove part #3932430dw.
what application was it for.

According to CRG it's for 307, 327 & 350 V-8's with C-60 (A/C) and C-60/N-40 (A/c & power steering).

You can check the CRG site - http://www.camaros.org/index.shtml - for a complete listing of pulleys in Adobe Acrobat format ( http://www.camaros.org/engine.shtml#PulleySpreadsheet ).