Ed, do you know if the cab and radiator are set up on the GMC's with more clearance for different engines? F370 GMC models (I think this is the GMC equivalent to Chevy LCF) were available with a 270 six cylinder engine, which is about 1.5" longer towards the front than a Chevy six. It was also available with a Pontiac-based V8 which is larger than a SBC, but I don't know by how much.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
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