Finally looked at my K20 burb's glove box sticker. No fuel tank listed.
It does have "no spin" diff listed, but I've spun one tire before, so I guess I got screwed out of a NoSpin Detroit by a PO. Gotta check just for hope's sake. 
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'71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup.
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