carb'd distributor 289/302 with gear for roller cam = MSD # 8598

Any "standalone" box will work for you, just depends on your budget.
Different boxes take different coils. The digital 6/7 boxes require an expensive coil.

Considering your setup, I'd stick with something cheap like a 6A or 6AL, and I'd use a MSD Blaster SS PN 8207.