Never trust the specs. furnish with the springs with no way to verify the actual pressures
![twocents twocents](/ubbthreads/images/graemlins/custom/twocents.gif)
Take them to a shop with a good valve spring tester and have them set your springs up while verifying the pressures, I like to see 140 to 160 lbs. on the seats and from 325 to 375 lbs. at max lift with at least .060 from coil bind on all 16 springs
![scope scope](/ubbthreads/images/graemlins/custom/scope.gif)
You need to use a set, pair of, checking springs to get the actual lift at the valves first before setting the springs up so you know the true max lift with your rocker arms also