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I had a 600 1406 and it was great for regular street driving but after changing to the Rochester 700 Q Jet my truck runs WAY better other than not having a choke, cold starts take a few mins to warm up. The Edelbrock used to fall on it's face at high speeds. On the Q the secondaries are huge and I get a lot more UMPH, burn outs for 40 feet! I don't know if this helps you as far as off roading goes but I would say go Q Jet either way.
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