I have neither an Emulex UC07 nor a DLT8000 so I cannot comment on
that exact configuration.
I have used Exabyte EXB-8200 8mm tape drives with CMD CQD-200 and
CQD-220 controllers to install 2.11BSD on an M7554-SD KDJ11-SD
(DECServer 550 CPU but with EPROMs replace with 11/53 version).
If you are manually creating the tape with DD make sure you pad the
tape blocks to the correct size.
If you grab the 2.11BSD distribution files from here to build your
tape the mtboot file size is 490 bytes:
http://www.tuhs.org/Archive/PDP-11/Distributions/ucb/2.11BSD/
That needs to get padded to a 512 byte block before writing it to tape.
If you look at what happens using maketape.c and maketape.data the
files are padded to multiples of 512-byte blocks before being written
to tape.
-Glen