I like them alot. My 66 C10 has the 420 behind a 292, and then a 250. Lets a 1/2-ton do pull/move things you would only dream of with a 3/4. The 7.02:1 1st gear is killer for rock crawling.
The second gear syncros are known for wearing out. So long as you double-clutch on the 1-2 shift, it will just keep on going. It won't put up with huge torque. Stick to a 283 or a 4.3L v6 at the most. Parts are getting scarce, so I would get a spare before you commit to the project - just in case.
Interesting tranny to put in an S10. Are you considering a solid front axle swap too?
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'66 C10 longstep - Clifford equiped
'84 C20 Suburban 6.2L - awaiting 4x4 conversion
'91 V3500 Crewcab - awaiting diesel swap
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