Long valves on W2's with .600 lift?

My W2 econo heads have the rocker stands milled off. They have 5.05 length valves installed. Any benefit to installing 5.30 "long valves" when running no more than .600 lift on the cam?

I'm switching to a lighter valve set-up by ditching the manley Race Flow valves with a 5/16 or 11/32 set of valves, using a lighter valve spring (bee hive or conical) and going with steel retainers rather than the Ti stuff I now have.

I want to run about 7200 rpm now and those 3/8" valves are not the correct formula.

Just wondering what you guys think.