My car has lowered floors and a tall FIA bar and at 6'3" I am safely within the limit for sprinting, the line is drawn from the top of the bar to the top of the engine, 2 relatively immovable objects
mind you my wife at 5'3" struggles to see over the scuttle 😳
I am often shocked on blats how many owners have their heads protruding above their roll bars 🙅🏻♂️
The tall bar is 50mm taller than the standard bar, a 1/2 hood is available for this from SB47S but you will need reinforcing strips to stop it flapping at speed.
Tall bars are, I think, still available from Arch as this is not a current CC product, will be with the single diagonal bar. Caged may also make a taller bar though I haven't seen one. Not sure about tall bars on SVs ?
I would hesitate ordering an even taller bar, I would concentrate my efforts at ensuring the seats are low and reclined sufficiently rearwards.
A lowered floor should not be discounted though, welcome to have sit in mine if it helps
Martin