Ricky S, sorry I have no 57, only 58s and they are 1/2 ton, don't know if same as 3800. One is a LW, i know it's a stepside 58 LWB series 32.
Good news, so far, turned over w/prybar on flywheel 2 straight 6s (GMC 228 and Chevy 235) that I've soaked for 2 weeks w/penetrating oil. Waiting on carb kits. All is going well. Thanks, Lefty.