I had been having lots of issues with split or cracked carb mounts for my PWK carbs on my ‘76. I bought and installed a set of aluminum adaptors with reinforced hoses (from Mike’s XS). Took it out for a ride and according to what I see in reading the plugs it’s now running leaner. Before the mount swap it would rev to redline without issue. Now on full throttle acceleration, when it hits 6,000 to 6,500 rpm it starts to misfire severely and I need to back off the throttle. Just checking that this is most likely a lean condition. I have main jets to swap but wanted to hear some opinions first. I’ve posted pics of plugs before the mounts were swapped and after. Please note the before pictures were taken when it was hotter out, maybe in the high ‘80’s. After pics were in mid ‘70’s temperatures.