Long valves on W2's with .600 lift?

I need +200 which is generally 5.140 depending on who makes them. Those stock sizes are all over the place.

I know a guy who has an R3 blocked Brodix headed engine that uses 5.140 on the intake and 5.160 on exhaust. I have 5.165 exhaust available from Manley. I'll do a mock-up to see if the longer exhaust will work. Or I can shorten the stem.

I'll copy that build sheet....has some interesting specs in the build.