Is your roll bar cage height legal? Looks like your helmet is right at it. Even if it is "legal", it sure looks unsafe. All the other drivers helmets are well below the bar.
The height of this roll bar is almost exactly at legal specs. At various tech inspections at Nat and NT's the top of my helmet is about half an inch below the top of the roll bar. Also the bar is made of road race legal diameter and wall thickness tubing and not the smaller and thinner tube allowed by solo rules.
1600 cc engines are allowed 2 carbs, larger valves and 10:1 compression ratio. Larger engines up to 1915 cc must use one carb, stock valves and 9:1 compression ratio.