Hey Guys, I'm trying to install AC on a 75 Chevy 250. The car originally started off with PS, so there were 2 groove pullies on the balancer and water pump which drove the alternator (groove closest to block) and PS (second groove away from block). I purchased some AC brackets and pullies and installed them with a compressor. The pullies were add ons for both the crank and water pump so that now each has3 grooves. I was told that in the original installation when you had AC that it was driven by the second goove away from the block, and that the PS belt is moved out to the third groove away from the block. Upong installing the AC I see that yes it aligns perfectly with the second groove. Then again, so does my PS pump pulley! So I need to somehow move the PS pulley further forward (away from the pump) and I already have a single groove, flat pulley. Do they make ps pumps with longer shafts, or was there a pulley that was an INVERTED bell (ie the groove is completely forward of the end of the pump shaft OR did they have different brackets to mount the pump in AC cars??? I am at a real loss what to do! Thanks for all the sage advice I know I'm gonna get from you guys!