First, the threads on the shock are designed so the coil spring can never reach coil bind.
So here's the facts as they've been brought up in this thread:
-headers scrape
-springs are adjusted to top of threads
-owner has no idea what spring rate is on the car (whatever was in the kit is not an acceptable answer as we tailor the spring rate to each vehicle)
-iron headed small block
-owner feels ride quality is poor due to springs being at the top of the threads
Based these findings I'd say you don't have enough spring rate, and the low stance and poor ride quality are due to the shock being bottomed out.
That car uses a 3.6" stroke shock with a 2.0" tall stud top. So distance from upper spring hat (on stock sub) to lower mounting bolt should be around 12.1 inches. Lower control arms should be parallel to ground (draw a line from inner frame mounting point to ball joint.)
Please provide this measurement and we'll go from there.
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