Too much roll stiffness?

[MyStylesTheBomb]

Howdy all. First post here. I've got a 66 Ford Fairlane GT with a 390, 3 on the floor, 3.50 open rear. Runs 14.7 seconds at 95 mph on street tires. I've done a good bit of the typical handling mods, GW upper a-arms, poly bushings, new rear springs, welded in subframe connectors. Cross bar in the engine bay in front of the shock towers. Bilstein HD rear shocks, KYB front.



I know it's a real nose heavy car and in stock condition understeers pretty bad. I upgraded the front roll bar to a 1"' and installed a new rear 7/8" bar. Handling balance is slight understeer now. I also have a 30 lb cocktail shaker behind the RR shackle, and have moved the spare tire so it's flat on the right rear of the trunk.

I've got a pair of airbags that I plan on installing at the rear leaf springs. 10 lbs is the recommended mimimum pressure. I want to get the car corner weighed and see how much additional air I need in one air bag over the 10 lb minimum, probably the right rear one, to get my corner weights close. Also since I still have the open rear I plan on playing with adding more air at the dragstrip to see how that affects my 60' times. Basically I want to be able to have it both ways, preload the RR for drag, change the air pressure so it corner weighs OK for street handling.

I wonder if there's such a thing as too much roll stiffness? I figure with the air bags I will need to upgrade the front bar to 1-1/8" to get it back in balance since I'll have a whole lot of rear roll stiffness, between the basic leaf spring anti-roll characteristics, the sway bar, and the air bags. I don't see a problem but I'd appreciate any input.

Any major flaws in my plan, or suggestions on how to do it better? Thanks, Scott