I'm 6'5" and still have the original seat covers and stuffing in my seats. I too am concerned about when I re-do the interior...I don't want to be like Dino in Fred Flintstone's cruiser.
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1966 GTO Coupe(#1845), AT, PS, PB, Nightwatch Blue
389 built by Gaydosh Performance - .040 over, 670 heads, 4bbl 750 Holley Double Pumper, Edelbrock Performer intake, Howards CAM and lifters, Scorpion roller rockers, TRW rods and pistons, Doug's headers, new TH350 with shift kit & 2000 stall, 8.2" rear with Auburn carrier & 3.55 posi Richmond gears
http://www.cardomain.com/ride/2240898/1966-pontiac-gto/