Long valves on W2's with .600 lift?

Forward of an e-mail I got from Mike basically asking me to get a hold of Krooser
re: cam grind for his w2 headed late model
Krooser is going to lighter valves so we have to rethink springs etc
trying to find a lighter exhaust 5.140 x 1.6 than last years Manley 3/8 stem necked down pro flow of 135 grams
we have to do guides so any stem will do
so far it's run last years 135 gm valve or cut down the +200 long sbc 11/32 11. gm valve
The Ti valves on hand require bead locks so have a longer turn around time to cut down unless anyone knows of a quick - quality shop
IMHO we might be able to get away with the 135 gm valve as the exhaust can have a milder lobe than the intake
although the cam will be for 4000 to 7200 and an endurance cam not a drag race cam
we can't be tearing down the motor and changing springs every week
any suggestions appreciated
current plan is for PAC beehives with the lighter retainer than last seasons Crower tripples took
would consider PSI PAC Ferrera no junk for springs maybe some Associated
Rumble- you have any spring or valve suggestions?

Krooser's been working 14 hour days give him some love here