Brad,
I'm not too experianced with the y-blocks yet, I just started with mine this year. Have you tested the compression yet? Adjusted the valves? Whats your plug gap?
Compression has a lot to do with power. Your rings could be worn or you valves could not be closing/opening properly. Did you make up your own plug wires? Check to make sure you have spark at all plugs.

Let us know your results.
Krosati
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