Yes there is. The in-out is to compensate for movement as your suspension goes over bumps and such. I can’t quote allowable tolerances for the in out off the top of my head. Hopefully others will chime in. If you do like Bill said and put new u-joints in hopefully you will be ok.
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1964 Tempest Custom
421 SD clone
KRE 74cc heads
KRE 230°/236° hydraulic roller cam
Rebuilt 3.23 rear end
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