No info for the front end.
What I eventually figured was that it'll be easier to just find a shock of the right length / mounting / valving for my truck as it is than it is going to be to find out exactly what's going on.
Here's the link to the Monroe application guide. When I start caring more, I'll buy some 1990 Chevy P30 box van front shocks. They'll fit and they should be good and stiff.
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Over my head"
1957 Chevy 3200, big rear window & 6 lug.
Front disc, power steering, Vortec 4.8 / 4L60E swap, hydro boost brakes & patina.