There seem to be two Tange Levins. The one advertised on the Harris Cyclery web site says 33.4 stack, part HD1001. I believe it has the smooth rounded cups like the chromed item shown above in this thread.

SomaFab.com has another Tange Levin headset that has a square groove with lettering around each cup -- this looks like the old Campagnolo Nuovo or Super Record headsets. And it has a somewhat taller stack they say -- about 38. I have one of these, not from Soma, but NOS from eBay, and it measures about 38.7.

If you get the smooth Levin, you should be able to lower the stack a bit by omitting the washer on top. The washer in the photo looks really thin already -- I don't think you'll find a thinner one.