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The 14bolt is found in a huge number of GM 4x4 pickup trucks and vans, 3/4 and 1 ton, from the 70's right through until at least 2000. You can find it in:73-96 C20, C2573-00 C30, C3573-00 G30, G3573-00 K20, K2573-00 K30, K3584-88 CUCV88-91.5 V30
i have a 454 in my 91 crew. stew what are you wanting out of the tow vehicle? do you want something that can haul a lot of people or do you want that covered cargo space the burb offers? if i had the chance to do it again i would prob buy that 99 burb with the 6.5(think that was the year) that i looked at a few years ago. also why are you stuck on the 14 bolt?
If you are going beyond the squarebodies, any 2500HD will have a 14 bolt FF