I found a suitable right-angle 50-pin header for the SCSI card while wandering
around in the Fry's in Palo Alto earlier this week.  This evening, I managed
to extract the straight header without damaging the board, and installed the
new connector.  The board fits in the backplane just fine now... and with a
power cable swiped from a dead ATX supply and a suitable SCSI cable and drive
from the pile, the card still seems to work. 

I need to find or make up another cable for the silly MMJ serial connectors,
and then I'll be able to try loading ancient Unix...

[[!tag tags/retro]]