340 Chugging instead of Reving

Rat Bastid said

Either that 29440 or the 29625 coil works with that box.

Your plugs look PIG FAT but I’m not sure I’m buying that fully.

I think you have multiple issues happening, especially if this engine was running fine and then it started having issues.

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The engine has never ran right. It's a new built that has this issue since break in a couple weeks ago.

I read the manual and see where they call out the two coils you mentioned. It goes on to say that it is compatible with all OEM coils but recommend one if the above. I have an MSD 3 coil that I'll swap in to check off another variable.