Looks like every other DSII distributor I've ever seen. *shrug
You disassemble it, change slots and springs, then put it back together with the adjustable Crane advance and follow their instructions to the letter.
Have you seen the RHP distributor recurve tutorial?
Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.