If it starts to get unstable, just let off the gas. Too many try to be a hero and stay in it.
Only time I've ever had a high speed issue was w/ bias ply tires that had too little air pressure.
On radials I doubt you'll ever have an issue, but keep em at 18+ psi on a 4k lb car.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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