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You can still use the msd box if you have eec, right? I plan on getting one. My truck sounds like Oscar's, but I have eec-4 and EFI 302. I agree, my eec system works fine, you just can't really tweak the motor as much.
You can still add the multi-spark ti eeciv if you want to, or it will work fine without it. I'm not going to do it.
I'm just going with a better coil and cap. Mine runs good too, 20,000 on new motor and all senors have been changed. But coil has 180,000 on it. Just seems like it would help Idle and low end response more. Don't really want to hot rod it. Rest of truck is stock.