Holley carb off idle bog/hesitation

[68Biscayne427]

Not to alter the subject here too much but how is your vacuum advance connected? Is it connected so it receives "full manifold vacuum" or is it connected so it receives "ported" vacuum. I recently moved my vacuum advance connection from ported to full manifold vacuum, and this help in my stumblingly problem. This also made a huge difference in the overheating problem that I was having at idle. Any comments or ideas on what is going on here?

Thanks - Rob