It is very possible that you didn't get the coil spring in the pocket right. I did this when I installed my HD coil springs in my truck recently. There was 1/4 difference in mine when measured. I did go back and put them in the right way. It was my first time and I didn't even notice the spring pocket until I was doing the passenger side, started on the driver.
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1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73
1992 Camaro RS 305 TBI
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