As stated above the 12-150 is in the ball park. To dated Ive tested the 12-150 and 14-150 with no real difference on my car. The 14 rubs the adjuster. Be careful with ride height when using the 12" spring. If I put the ride height low the 12" is loose in the spring pocket at full droop so make sure you check that. This has not been an issue with the 14" spring no matter how low I set the ride height.
Im currently testing a 14-130 spring and so far the nose pops up much quicker. My RT have improved because it yanks the wheels up out of the beams. I dont have enough data to say if ET is better.
Stock Block 408", TFS 11R 205, TFS EFI Carb R Intake, XFI 236HR, Tweecer, Faceplated TKO 500
10.49 @ 130mph
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