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If you already have a good functioning Mallory I'd stay with it. There isn't a better built or more reliable distributor. It's built like a tank and uses an optical sensor. They are harder to kill than the Petronix modules. I burned up 2 petromix modules (100a/pc) in my last car before I paid 400 for an MSD. ye NEW they aren't cheap, so I bought MSD for the spring tunability. Yes, Holley has your parts. Don't call they keep you waiting for ever. I'd use it unless it's real old with loose bushings. HEI won't fit with any factory components on the Fords. You'd be better off with Fords later model electronic dist. If it was me, I'd sell the box and get an MSD 6a. I buy used 6A's and send them to MSD. They rebuild them for @ 97.00. It takes a week. The good thing about Mallory is you can get used ones & the modules cheap on Ebay or etc, since their co did such a lousy job with the branding and following up with their product.