I run 230# seat pressure (when installed, not sure what it is now) and 700# open pressure with the cam in my sig. It has around 0.640" lift with 1.65 rockers and my installed height is about 1.890-1.920". I shift at 6500 rpm and cross the line at 6700 rpm. I use 0.060" spring cups with shims underneath in Eddy heads with 2.19/1.77" valves CNC ported to 335 cfm. I think your spring pressures are fine unless your expected rpm is higher.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule.
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