I'm still looking for a crank pulley #1235779 (two groove). That pulley fits a GS, Riv or any Buick 455 without AC, 1 or 2 breather tubes (the rubber prebent tube that runs from the 70-72 GS air cleaner to the valve cover part #1232085). Thank you.
I've contacted Fred and he has said he may have them but he seems to be very busy. I'll try him again. Thank you.