It really doesn't matter what year engine you have but more importantly the material the cam is made from. Over the years steel cams have found their way into later motors and cast cams into earlier motors. Match the distributor gear to the material the cam is made of not the engine.

This should put it in focus for you, complements from Dave,

http://chev235guy.blogspot.com/search/label/Distributor%20%26%20Cam%20Gear%20Identification

Last edited by sstock; 09/06/2019 2:55 AM.
1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
In the DITY Gallery
Video of the 261 running

1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration