Is this a roller block? If not you'll need retrofit rollers, different pushrods, a method of limiting cam thrust, distributor gear, and springs matching the cam specs. If it's a small base circle cam you need to be careful too as the lifter will travel further down in the bore. Is this a stroker? Personally I would run a hydraulic roller.
AS far as testing your valve springs, I would check them uninstalled on a valve spring tester. This is the one I use
Any machine shop should have one, you could bring a spring down to them.