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It's crazy shit. Back in the day it was probably best to do what I did - buy a Holley 750 vacuum secondary, set the floats and idle, and have fun.

It's pretty funny, a few days ago I posted the "I wouldn't belong to a club that accepted me" quote and here I am...

Even people who are pretty good at this stuff are iffy about messing with emulsion. That said, what they generally say is leave it like the original Holley setup. It should be pretty easy in your case. Leave the highest hole as is and plug the second from the top. Then leave one of the two lower...

I was just going to ask that! They are odd blocks. So what you have is three emulsion holes vs the two that I talked about. They're kind of semi-adjustable, meaning the holes are fixed, but you can install a set screw that has a smaller hole. Is the highest of the four holes about the level...

Cruise with a cam like that will probably be happier a few hundred RPM higher. Have you thought about swapping on the 650 on to see how it runs? It that a vacuum secondary?

How does it run in that RPM range? It seems a little low for that size cam.