th350 (6" tail) and 200-4r are the same length and use the same shaft. You usually only run into issues when you go 7.5 to 8.5 differential or run a transmission of an over all different length .... the attached document shows trans sizes. Curiousity has the better of me .... has the 200-4r failed? It's most likely a uni-bell and would fit your SBC with no issues. You'd probably be ALOT happier with it than a 3 speed.
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