so you can use a std z28 spring on these without modifications? I might pick a set up and have him install them if thats true.

How about these?

SEAT PRESSURE
110 lbs. @ 1.750"

OPEN PRESSURE
325 lbs. @ 1.200"

COIL BIND
1.150"

FREE HEIGHT
2.030"

NOMINAL LIFT
.490"

MAX. LIFT
.550"