Drag seats for a F150

Been looking at racing seats on the internet and was wondering if some of you that race a standard cab F150 would share your thoughts on what fits/works. I am 6'3" and 245lbs, and am not sure how much layback I should get if I go with a Kirkey or if I should put in a sport style racing seat. Also, this truck will have a roll cage in it, so I will the c bar (I think thats the right term) move the seat forward more or can it be adjusted so that I can get the seat back as far as possible?

If your as big as that YOU DON'T need a seat

I just ran my seat back so that it's sitting right against the crossbar, with the hoop as tight as I could get it to the back of the cab. I'm 5'8" and about 180# and I feel it's a little more snug than I would like still... If you'd like, I'll get ya some pics this weekend...

What about running the c bar on the outside of the cab to gain a little more room?