I'm 6' 2" as well. My seat is bolted to the floor all the way back and I have about 1" of leeway between my knee and the dash. It's a close fit, but very comfortable.
I drove a standard SPF with the adjustable seat rails in place and I felt like my head was almost above the windshield and was pretty cramped. You don't want to look like a Shriner.
Good luck with SPF build!