You're on the right track, Pat.

I've always wondered why GM used the edges of the holes for dimensions rather than the centers. It's not that hard to measure to the center of a hole. ohwell

The tolerances on the dimensions are pretty loose overall anyway, with most being +/- 1/16"

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.