Hey Thomas,
I have an older system - Allison - on my BJ8 and other than currently
hooking it back up after replacing a wiring harness, it worked well.
From what I have read from various sources, using the current unit
from Petronix is a good way to go. Pretty cheap and easy to install and
once set up right, you're good to go with no worries about points, etc.
Google "Petronix Ignition" and you will find a lot of info about it.
Moss sells it and you can find them online as well. Assume one is
available for a BN1.
Good luck,
Mike