[Tom Goldman]

Just my opinion ,but at over 4000 pounds a 5 point roll bar is not going to offer much protection in the event of a crash at 120 or for that matter any speed . A lot can happen on a 1/8 mile run , or after the finishline , especially on small tires .
You should definitely consider a cage . If street driving is a consideration, a 8.50 or slower cage can be built with removable side bars .