You should be able to get a pretty good idea of overall condition with the calipers. If you want to get a more precise overall measurement you would have to use an inside micrometer, but my opinion is that would be overkill if you already have a caliper.

1941 Chevy
"First rebuild - complete!"
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1941 GMC resting peacefully
1946/1947 Chevy Street rod on s10 frame complete
1945 GMC panel truck in line for restoration
1941 Plymouth stock complete
1941 GMC COE in restoration process
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1941 Chevy Coe uncertain future resting now