Carburetor Question - Is this a good call?

That Holley should be easy to fix with a new kit, Holley has plenty of videos on their web site to help you thru it.
Also if you do not know much about carbs, I would suggest anything new, before buying another rebuilt one.
It may not even be the carb issue, how is the tune on the engine, are the valves adjusted correctly, what is your timing set out, do the basics first before throwing parts at it.