Anyone fitted a Crane XR-i Ignition module

Has anyone out there fitted a Crane Cams XR-i ignition module (points replacement)?

I've fitted one to my 66 2 door hardtop with A code V8, and it binds up the vacuum advance. I can't run the engine yet, as it's still under re-build.

Is this a common fault (could be corrected with a couple of shims), or have I got a dodgy dizzy?

Thanks folks.
 
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