Carburetor issue, I think

I got a carburetor last year pretty well not a cruiser, but an aftermarket one and it was great but this year when I started out the boat on an engine replacement I noticed the carburetor was doing a lot of crackling. But was not running well at all. Check the timing check the dwell check the points. Everything was good

I put on my old Mark cruiser that I had on the bench I rebuilt three times because I thought it was a problem with my boat dying after 20 minutes turned out. It was a resistor wire anyways that carburetor wasn’t the greatest when you went to throttle up it would pop a few times and then die but anyways the carburetor ran great idle wise, so it’s not the engine or any other ignition parts

My question is when you hear crackling from a carburetor you just replace it or is it an air mixture scenario or is it too much fuel? I really don’t wanna open it up because I doubt I’ll find a gasket set for it.

crackling

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Don't fully understand the term but any kind of back fire or other in most cases is not the carb but timing and or the motor. Intake valve leak

Without more info I suggest a compression and leak down test

I am struggling to understand your post/language...I think you are saying you got a carburetor that wasn't a Mercruiser (Mercruiser does NOT make carburetors by the way...assume you meant Holley, Weber, etc)..to replace the original (Holley, Weber, etc) that had been performing poorly? And now the replacement is not performing correctly? When you "rebuilt" this carburetor "three times"...uh, what exactly did you do? To do it correctly means disassembly, ultrasonic cleaner, replacing seats and seals and gaskets...is that what you did?
You too easily dismissed other "engine issues" simply because you feel that it can't be carburetor related because it idles fine. I am sure you know this since you are a carburetor expert, but the idle circuit on a carburetor is not the same as the transition to jets and fully on the jets. Timing problems can cause the condition you describe, as alldodge notes, bad ignition components can as well...when did you last change the distributor cap and rotor for example?