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Your secondaries are opening at wot and working properly?
Here's the key question. ARE your secondaries opening after the engine is fully warmed-up? If not, then the wire sending power to the choke spring may not be allowing the butterfly to open all the way - it may not be sending juice. On a cold start, the primary butterfly will be closed all the way or else it will not start. After the engine is fully warmed up, the extra heat the power wire is sending to the manifold spring allows it to uncoil enough to open the butterfly all the way. My '73 Charger 340 had this problem & I could never get the secondaries to open.
If you are not sure if the secondaries are opening, wait for the engine to come up to full operating temp, then shut it down. Disconnect the choke arm on the butterfly & take some mechanics wire & wire the butterfly full open. Take it out for a ride. If you are having the same problem I had, it will feel like you bolted on about 80 HP.
No Man With A Good Car Needs To Be Justified
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