340 Full throttle hesitation

Also, are you running vacuum advance on the distributor, or no vacuum advance.

Look for a vacuum hose coming from the carb to the vacuum pod on the distributor.

If you're not sure, get some close ups of the carb from all angles (front, left, right, and rear and make sure that they show the base and all vacuum line connections.

Also if you do have vacuum advance hooked up, where is it coming from on the carb? The base or higher vacuum port??? A common mistake is to use the wrong vacuum source, which could cause poor performance...

Pictures are worth a thousand words here... If we could see it, then we can let you know what you have and how to proceed.


Also do you know the difference between initial timing and total timing? You will need to know to get the timing dialed in...