man this is an old post... a early bmw 320 dizzzy truns the right way( weights) yes it has points. but i have removed them, useing hot spark for a v-dub place, this way i can use a msd 6l in my system, a stock 84 spider cannot use a msd box.
The 123 distributor has a bunch of selectable curves and I have tried a few of them. The Bosch 0231 110 045 is a good one. It was original on Euro 2L Spiders. The more common 0231 178 006 is rather docile and it gives less mid-range power and worse fuel consumption. The Shankle curve is very good except that it is hard to get a good idle, at least with Weber equipped cars.