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Have a question. In the picture I'm posting the cam stop on the right is a Hemi super stock cam stop I bought in 1971. The picture in the middle is of a cam stop from a single point marine dist and the cam is the same as the S/S cam. Clocking for rotor probably is different. Could AR67GTX use middle cam stop with the 4 sec flat mechanical cam limiter Kowal mention in post #14? MULTI PICTURES THEY DIDN'T SEEM TO LOAD I WAS BUTTON HAPPY.I need the Imperial Distributor IBS # to look it up in the manual. BUT... the one LC with W Cam Stop I have came from a IBP single point distributor for a 413. That camstop will not work in your IBS hemi distributor as the cam lobe diameter is smaller for single point versus dual point. You can check between the two you have. It should be obvious once you look at the dimensions.
To be clear, your talking about the vacuum parts on the Hemi distributor correct? Did you remove vacuum fitting and measure spring length and the internal washer stack thickness? That would be helpful to me. The arm number is the max vacuum advance in distributor degrees.
Lastly, the service manuals for Mopar have the rebuilding specs for dual point distributors. You do not want a lot of lateral or axial play. The double stack thrust washer at the top is normal. Depending on how the collar was drilled, I have found one position may give different clearance then another, and you certainly have to have it on correctly. Later Chrysler types with plastic collar are notorious for this. So I am surprised you would have to press bearing down because too tight. Normally you would have wear and it would be looser.