How much roll bar or cage is needed for 10.00 & slower

My Daytona maxed out it’s cert at 7.50 because it was mild steel but I never went fast than 8.42@160mph. It had a funny car cage when it was 8.50 cert and needed 7 or 7 bars to get a 7.50 cert. I had the cage taken out of my 82 charger (old pro street car) and had chrome moly put in because it needed some weight loss and the price was more than right (1100.00) but I only ran 10.00 about 100 times in it. The green duster I just sold and my black duster are mild steel and 8.50 cert. My blue duster is full tilt chrome moly 6.50 cert. mild steel cars if built right still bring nice money when selling.