I'm 6'6", 280 lbs with size 15 shoe.
I "tried on" over 20 different cobras and couldn't work the pedals in all but one. I had the bug bad though so even though I could only fit in one out of 20 I sat in I ordered one anyway.
I used Wilwood pedals which are adjustable. That added 2" of legroom. I also have 17" Kirkey Intermediates which I cut into low-backs and are being mounted to the floor. This add 2" more legroom and my eye site is below the top of the windshield. I also have a quick-release 14" wheel, which help as well. Last thing I did was widen the foot box using a pre-cut piece from an after market vendor. I can work the pedals in sneakers now, instead of having to use driving shoes or going barefoot.
HTH,
