68 Dart first time out

When you run at a IHRA or NHRA track a roll bar is required.. Its a 11.49 or faster in the 1/4..My car is a street car but I'am putting a roll cage in mine because the motor I'am putting in my car has been mid 10s on motor..I'am adding a little more converter and a little less gear 488s to 456s..The motor is in my dads duster..


EDIT--When do I need a roll bar or roll cage, and what should it look like?
A roll bar is required in any convertible running 13.49 seconds or quicker in the quarter mile, and in other cars beginning at 11.49. The roll bar is accepted in vehicles running as quick as 10.00 second e.t., provided the stock firewall and floorboard is intact, other than for installation of wheel tubs. The rollbar must be constructed of minimum 1 ¾ inch o.d. x .118 inch wall mild steel tubing, or 1 ¾ x .083 chrome moly tubing, and must conform to the following diagram: