Question you need to ask yourself..."Do you want/need your current engine to rev to 8,000 RMPS??!!
If the answer is a resounding NO!!!
Then consider just replacing the existing springs with a set measuring considerable LESS "Fully Open Valve Spring Pressure".
Your current FOVSP is calculated on your engine revving to 8,000 RPMS.
Would you be satisfied with a Redline of 6,000-6,5000 RPMS?
Without knowing your exact FOVSP, I imagine by changing from a 8,000 RPM Redline to a more conservative 6,000-6,500 RPMs redline could reduce the valve train stress/wear by at least a 100 ft lbs.
You could still utilize your current camshaft.
At the worse by going to less FOVSP with the current cam, you could experience valve spring float at higher RPMS, which is like a built in over rev indicator
I would be Extremely curious if your engine is still building horsepower beyond 7,200 RPMS!...Mark