The AEM ignitors and ignitions are junk, I have seen many of them fail. M&W makes some good ignitors , also Haltech offers a tripple channel ignitor for about $155, you would need two for sequential ignition, or another good option is to run smart coils with a built in ignitor. We have had great succses with these using Haltech's, the LS coils work great, but they use plug leads, which may be a good thing on the 7M as there is allot of stuff ontop of the engine, you could mount the coils to the fire wall, or under the intake manifolds and run the wires to the plugs. We have also used the Toyota 1ZZ /2ZZ coils in a few cars including my own, they work great, but they may be a little tall for the 7M.
We are a Haltech dealer and can get you great prices on all things Haltech including ignitors and sensors. PM me if you want pricing.
Randy