Distributor for Boost

I guess I will just go the ignition box route and find one that retards boost. I have always been a fan of Mallory boxes over msd. Mallory makes a hyfire charger box that does the same thing as msd's boost retard box but it comes with a GM MAP sensor and rev limit switches instead of having to buy a rev chip. With the box can I keep my stock distributor and just remove my vacuum advance? Or do I just install a vacuum check valve in line with it so it doesn't try to push boost into the vacuum actuator but still sees vacuum off boost to give it a good idle?