800cfm on mild 360 ?

First step...Always check the float level on these Eddys.
More often than not, they are off. This one is spot-on, I must have already checked them.

View attachment 1715576406

Also check the fuel level after you have adjusted the floats to make sure it covers the pump well. I had 2 800 AVS carbs that had to be adjusted much higher to get the fuel high enough. Make sure you do it on a level surface to get a good accurate indication of where it is. I ended up cutting up a top plate from another carb to see where the "Real" float level was when adjusted to different heights