What looks stupid to me, is that it seems like the back sits higher than the front. Also, he should have put a gun ring mount in the middlesome guy recently did this with a jeep.
Looks pretty stupid (even for a jeep)
http://www.pirate4x4.com/forum/jeep-non-hardcore/1055085-urban-assault-tj-zombie-killer-build-7.html
The GMC's didn't have multifuel engines. Old White inline 6's.
The Kaiser M35 family of Deuces brought in the Rockwell axles and multifuel engines (but originally were gassers too).
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