This from Gary Pavlovich, over on the Forward Look mailing list… Gary also wrote privately:
Thank you for the referral; let me know if I can help your group with any of the Poly parts.
I do have all grinds of Poly High Performance Camshafts as well as all the internal parts available.
Also have a couple completely rebuilt Sure Grip third members for sale(all new bearings/seals, the superior original clutch-type Sure Grip unit in each third member);
742 case 4.10 ratio w/clutch Sure Grip
or I can build a 489 case with any desired ratio...