I just put this one in my 67. I have plenty of room with the tilt and a different wheel. I am a 6 footer around 200 lbs. Tank has also been removed. I think this is a late 80's or early 90's seat.
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http://www.picturetrail.com/jwill41
67 1/2 ton GMC short step side
68 1/2 ton Chevy long fleet side
72 1/2 ton Chevy Suburban
99 1/2 ton Chevy Suburban
founder (and only member) of the primer/clearcoat club