Don't despair! You have options!
The DSII distributor will fit with some work...you'll have to turn down the housing where it goes into the engine, and swap in a newer oilpump and oilpump drive. Sounds hard, but you can easily pull the crossmember, pan and oil pump yourself, and any machineshop can reduce the distributor in no time at all (and I'd think for very little $, too).
If you don't want to go that route, the MSD box will work just fine off of the points, and the points will last forever. Points aren't as precise a trigger as the DS, but unless you're revving over 4500 rpm I wouldn't think you'd notice. There's nothing particularly wrong with a Load-O-Matic system that's working well, it's just adjusting one to a particular timing curve seems to be a lost art (if it ever was possible).
I'd say to go for the new oil pump and turn down the dist. housing, and go ahead with the swap. Not too hard to actually do, and you'll have an ignition system that much more easy to recurve, check, and maintain. (plus I'm really liking my new HW5200 carb!)