The ATI balancer will fit on a Callies crank and allign up just like stock for the stock serpentine belt but it's the face of the ATI damper that stick out (if it was on the motor it would stick out towards the radiator) and the face of the stock damper is recessed (towards the block).
I machined the Pro Charger crank spacer to fit the new balancer but it looks like it's going to get machined again to fit my new crank trigger sensor...
I think I got some pictures on a disc at home, will take a look and post later.
Marc
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94 Z/28, 383 D-1
Marc's Blown 94 Z/28 "Want it, Have it, Have it, Want it"