3,500 hours in them, I'm 6-0 and 185 pounds and while not "spacious", I always made due. The good news is you can only keep one aloft for 05+30, even if you work at it. 6-4 will be just a bit tighter but you can do it.

You might want to think about making your own seat cushions ... you can save an easy 3" up/down and fore/aft and still be comfortable.

TransMach

P.S. I love my IPELCO seats and cockpit room in the GV ... much better than our G550. The jumpseat is way better in the GV also!