Smog Pump Woes...

Does anyone have any clues where to find a good stock replacement or maybe a rebuild kit for an air/smog pump '66 289?? Right now it turns ok but definately growling when at idle so need to fix soon... so far car is all original and want to keep it that way otw would have been missing long time ago our local shop quoted $255 WITH core for a repo and we dont want to go down that road...

good catch! this is actually my dads daily driver that we bought and restored in CA where he lives... and yeah as far as we know, short of coding the vin (lazy), it was born/raised in CA. 1/21,000 A-code with bench seat. Thanks for the link the rabbit hole keeps getting deeper haha