It's interesting to note that Oldsmobile V8 distributors rotate the same direction as Pontiac, but the helical gear is cut with the opposite slant so that the distributor gear is pushed down during operation. There were no shims on an NOS mag pulse Olds distributor that I bought a while back. They have a pad in the block that supports the bottom of the gear during operation.
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Hoping to finish a project while I'm still able to push the clutch in.... 
1963 Tempest Convertible (195-1bbl, 3-speed transaxle. 428 RAIV, 5-speed, IRS planned) Pictures
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