I was just gonna go with new springs with a stock spring rate. Good thing to know about the feeler gauges, never though about doing it that way. I just used the normal method of setting the valve lash, had an old hot rodder show me how. I gapped them first cold ( 8 intake, 10 exhaust), then warmed it up and gapped them hot (10 intake, 12 exhaust), it's the only way to do it.
I will put more miles on it and see what happens....