Its really a give and take with valve train, stiffer springs will use some more power to overcome the pressure, but lighter valves almost require them, as it will rev a little higher than stock and you don't want any valve float at that speed either. Make sure you get under cut valves, as they will flow better and compliment your other mods. One thing to consider, is a 3 or 5 angle valve job, by a GOOD machinist, many machine shops claim they can do them, but I wouldn't trust most of them. If you are going this far, you might also want to wrap your head pipe with some header wrap to maximize scavenging effect off the exhaust valve. All this said, you might see a 5-10% increase in overall power and might want to consider a bigger carb, if not already done.
Of course, all this is in theory, and if applied incorrectly, can cause an adverse effect on power increase.
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