In my younger days we used to put aluminum window screening sandwiched between 
2 carburetor spacers to help atomize fuel. Theory was that the screen creates 
micro vortexes and helps with a more even air/fuel mixture distribution to all 
cylinders. We didn't have a dino machine to test this out, but my guess would 
be that we gained at least 5hp. 
This might be worth looking into for the uneven burn problems. 

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