roll bar

[DaveyB]

Hi could anyone tell me if it matters with IVA if my head sticks above the roll bar i purchased a roll bar from Ash a long time ago and recently have been mocking up my seats and harnesses and when sitting in the car i think my head is close to the top i am 6'6',don't want to start welding only to find it fails iva? and am i ok to bolt straight through the floor with the seat fixing bolts.
Any help would be greatly appreciated
Thanks
DaveyB