I would buy the baddest box you can afford. Most power adder stuff grows to more and more power and you might as well avoid buying twice.
Don't buy any of the combination street and strip MSD boxes for your deal, buy race only Once you get bit by the power bug you will find out there is never to much power, just like never having to much money, sex, traction HP and on and on Another thing to remember is on the spark plug gap, you may need to close it up some as the power level increases and the coil wire and spark plug wires won't live as long either due to the ignition making more energy to make the spark jump across the plug gaps on power adder motors Speed cost money, how fast do YOU want to GO
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)