John;
The 6AL will do you just fine. If you want to get into major boost, just add the MSD BTM -- Boost Timing Master. It plugs into a 6AL (I think), and retards timing based on the boost that it detects through a vacuum hookup similar to how a boost gauge hooks up.
Or, you can just get a Digital 6 box, like me

It does NOT have a boost timing retard function, but does have a nifty two-step for launching at the dragstrip, plus an adjustable rev limiter.
Just a thought.