Yep, I run those metering blocks on one of my 4500 dyno carbs. The good news was that I was able to finally tune the three circuit carb so that it would run great for an entire dyno pull. The bad news is that you have to futz around a bit getting everything happy with the thicker metering blocks. (longer bowl screws, longer fuel inlet, bend the accel pump levers, etc.) Nothing that you can't do, but some guys might struggle with those modifications.