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Hi,
You mention a dual disconnect but I might suggest you just need to install a diode on the alt. wire to collapse the field and then remove battery supply via the single disconnect.
Avoid the 5 dollar switch from places like Harbor Freight as they are a bit too cheap for this application. A disconnect switch needs to handle some serious amperage and you do not want it to install high resistance in the battery feed nor do you want it to stick or hang closed in an emergency situation.
Break the Positive cable although many will suggest the ground side. The positive side switched allows everything to remain grounded even in our fiberglass cars and they way most are wired. Use the diode as described very well on the MSD web sight under - when installing MSD ignition. with 1 wire alt. use. PS..... quality switches are avail from Jegs, Summit and so on. NHRA approved is the seal to look for or their amp ratings anyway. Have Fun !!!! No big deal and only a 2 adult beverage kinda job
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