Value of the MSD

My 74 Duster is going through some changes to increase power, improve 1/4 mile performance and over all fun factor. I am building an approximately 400hp 360 Magnum to replace the tired 318. It has an A500 transmission and a 4.30 gear. It cruises the highway at 2600 rpm doing 65mph.
I am looking to add an MSD Digital 6 Plus ignition because I have it, I've never tried one and it will give me the ability to mess around with Nitrous if I want to.
Now for my question, is there a benefit to using an MSD distributor or can I stick with my stock distributor and retain my vacuum advance for the highway. Below is the MSD distributor I have.

Cley

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