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At those speeds, air under the car is a factor. I'd be thinking about a front air dam, too, and running the ride height at about 5 degrees nose down. As the previous posts have recommended, good shocks, and as much positive caster as you can put in it.



Some float at 140 mph doesn't sound that bad. I bet the aero is pushing the front end up a bunch. Then combine that with old front shocks and maybe? not much caster.