Just an FYI, and please realize this is third hand information.
An Internet friend over on the OldGMCtrucks forum has recently posted information on using a Viton one piece rear crank seal from BOP Engineering in his '55 GMC V8 (Pontiac 287). It has over 2000 miles without leaks. With BOP Engineering's blessing, his engine builder cut a section out of a 389 Viton seal (for 3" crank journals) to size it down to run on the 2.5" 287/316 crank journal. BOP told him to be sure the cut was at 12 o'clock when the seal was installed. A comment from his posts is "When I was researching this I called up the company I found them helpful in talking thru any problems I might have. Their contact info is bopengineering.com 930-6746059". Same idea should work on 3.625" journals of 57 and 58 engines.
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic.
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