Yep. You are slightly rich in the middle and lean at WOT. I forget what intake you have, but you have to jet to the leanest cylinder. Or as MO said, work on the intake to correct the cylinder to cylinder distribution.
Also, I'm not a fan of a 4 hole spacer on a open manifold. I've yet to see that work, even with tapered spacers. The only time I use a 4 hole is if it's an anti-reversion plate. A true AR plate. And those require some work to install or those don't work either.
My intake is off now so I can make the AR plate fit. It's now become a winter project.
