Msd 6al

While the box will help, whether your ignition needs any help is the real question.

It depends on how much cylinder pressure you're making and what RPM you're turning. The MSD Ready To Run distributor isn't a capacitive discharge or multi-spark setup. I'd say it is roughly equivalent to the HEI conversion setups for spark power. The MSD 6AL produces a hotter spark with less dwell time, but unless you're spinning the engine so fast the RTR can't get enough time to charge the coil or making so much cylinder pressure you blow out the spark, that won't help.