4.2 on a uVax II?

[nrh at inmet.UUCP]

Does anyone know where I can get a version of 4.2 BSD (or just the
diffs) that will let it run on a micro-vax II?  I don't
want to buy Ultrix (I need to have source and to modify the kernel).

The best response would be someone telling me that "sure, we run it --
send us your source license and I'll send you a tape", or some such,
but any help at all would be appreciated.