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Hmmm, makes me wonder? I would bet anymore that there is NO difference at all, especially if you're getting a A zone rebuild. You can alter the curve yourself to suit your needs anyway. A couple bucks and a saturday afternoon you could have yourself tuned right in.
Yea, just have them give ya one for a 360/390 and dial it in if you want or need to. If you don't really care and it runs with no issues welllllll then just run it.