??Distributor shaft depth in oil pump drive??
I'm a few days late to the party here but had a very similar issue with the distributor. Converted from the Mopar Performance to Mallory that comes with the Pro Flo 4 system. The MP distributor engaged about .100 but the intermediate gear has a slight chamfer. The MP shaft did not have a chamfer but the Mallory did. End up the two chamfered sections were all that was contacting and allowed about 15 degrees of free rotation. All measurements pointed to the distributor and edelbrock swapped it out for me. A new intermediate gera and bushing combined with the new distributor (.040) longer fixed the problem. I picked up the Proform tool from summit and worked well for about $100. Top distributor is the Mallory, bottom is MP.
I'm a few days late to the party here but had a very similar issue with the distributor. Converted from the Mopar Performance to Mallory that comes with the Pro Flo 4 system. The MP distributor engaged about .100 but the intermediate gear has a slight chamfer. The MP shaft did not have a chamfer but the Mallory did. End up the two chamfered sections were all that was contacting and allowed about 15 degrees of free rotation. All measurements pointed to the distributor and edelbrock swapped it out for me. A new intermediate gera and bushing combined with the new distributor (.040) longer fixed the problem. I picked up the Proform tool from summit and worked well for about $100. Top distributor is the Mallory, bottom is MP.