OK, I'm not skilled in a/f ratio, but if the problem started after spacers were installed, start there. Dick B. may have already suggested to blank off the end carbs at the manifold and ck results. Yes, as steve25 stated, you're only running on the center carb, but if the end card throttle bodies and blade seals were disturbed, air intake leakage may result affecting the a/f ratio. Next step, put it back as it was w/o spacers and ck results. My $.02.
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