A GSS340 is for a return-style fuel system...a lot different than the new Mod motors run. I would be looking to the '03 Cobra solution as well.
Keep in mind this may be a timing issue as well. If the dyno tune was set up "on the edge" in the warm weather, it WILL ping in cold air due to the cooler, denser, more oxygenated air mass. You should be looking into a way to pull out some timing in the cold as well.
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Novi 2000 now spinning off the snout of the 331...
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