Follow up. MSD, is it worth it?

I have a vendicator(big boat) with a high performance 460 King Cobra.
It has a stock DIS ignition system. One of the Coil Packs has burned out. After searching for months I found that the packs were discontinued. I do not want a salvaged one. SO, I am looking at a MSD system. I have a Mallory Unilite Distributor, I planned to get a MSD 6A ignition with a blaster coil and go from there. But, After reading your opinions on "is it worth having a MSD system" I am having second thoughts. I could go stock, but would I still get 400+ HP? No I would not with a stock system. So Is a MSD system worth it where my application is concerned.....?

Thanks
Dakejh