how strong is the 8 3/4 #741 case?

I

rebelcaptain said

The Dodge Coronet 8 3/4 is only 1" longer than the A-body 8 3/4.

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I don't think the total length is as important as the spring perches would be. Get a measurement, grind them off and move them into the correct locations and weld then back on the tubes. It may even help for tire clearance.