Thanks Wayne! Mine appears to be the same diameter. I put some 1/4-20 allen headed bolts in it and dropped it off at the machine shop so they can complete balancing.
The diameter I hope doesn't cause me any grief with the crank trigger. My crank trigger is like 8" across, and I went looking for a 9" or 10" one and didn't come up with much luck. My current plan is the shim the trigger wheel out about a 1/4" from the hub and hope the sensor can pick it up without interference from the iron ring.
I think it will be okay, as my Skylark's trigger wheel is smaller than the pulley it's behind, but not by much and certainly is not right next to the sensor. And it's been that way since 2011.
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"How I learned to stop worrying and love the OHC Pontiac L6"
The Silver Buick- '77 Skylark coupe w/455, SPX, MegaSquirt 3 & TKO-600 (Drag Week 2011, 2012 & 2015!)
1969 Firebird with a turbo'd Pontiac L6 controlled by a MegaSquirt 3 and backed with a microsquirt controlled 4L60e and 4.56 gears! (Drag Week 2018!)