Helical cut gears just change pitch angles to accommodate for ratio or diameter change.
Think of a rear differential that has the same spacing from pinion center to ring gear carrier surface dimension, but by changing the pitch angle is able to accommodate different ratios within the same dimensions.
Pontiac engineers knew there would be more stress from using the 80 PSI SD oil pump, and wanted more tooth contact area to compensate for the higher stress on the 2 gears. Increasing the distributor gear diameter, and adjusting the tooth angle gave them added strength on the driven gear, and more area.
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Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
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