[Carnut427]

Yes, you can get by without a booster, as long as your master cylinder is sized correctly. Can't help you much more than that, as mine uses floor-mounted pedals and a separate master cylinder for the front & rear brakes with a "balance bar" connecting them to the brake pedal to adjust front & rear brake proportioning. It's a completely different setup than a top-pedal system. You might try asking the same question on the Midstates Cobra forum, as they use the system you're interested in.
Good Luck,

Dan