[T.L.]

Im 6ft 4in but purchased a Harrison rolling chassis with the extra 100mm in there and worked around that.
I also had the floor dropped to pick up the bottom of the chassis rail as this gave me an ideal seat height. I have a long back so on all 'sports cars' I eat bugs or look straight through the top of the screen.
Lowering floor helps quite a bit with leg room around the steering wheel, as my legs hit the wheel on real cobras kirkam and robnells so I had to avoid that issue as well.
Good luck with it all.