Carb choice for a mutt motor.

Professor Fate said

Make sure your throttle cable is set so you're getting full throttle travel and opening all the way. If you have an aftermarket carb already, it may require a Mopar linkage adapter (if it doesn't already have one) in order to get correct travel.

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I would double and triple emphasize this. Have seen too many setups that someone thought they could just hook the throttle cable up anywhere and it would work OK. That would be the first thing I would check. Then follow up with all the other suggestions.