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For starters, what cam did you install?

Some cams don't like the non-adjustable rocker arms after they are installed, basically the pushrod length is thrown off, either too short or too long, not opening the valves enough or leaving them open and bleeding the cylinder pressure off too fast. Were the heads shaved at all?

A carb out of the box is truthfully impossible, too many applications. Start with the two needles, turned all the way in gently to bottom them out and turn them out 1.5 turns each. We can tune from there. Double check the firing order 1-8-4-3-6-5-7-2, then check the timing. Disconnect the vacuum advance and plug it off to start with, Double check any vacuum leaks at front and back/base of the carb that it is sealed, including carb to manifold.
 
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