I had a STOCK 302 shortblock (other than a Lunati cam) from a truck in my car. Vic Jr. intake, iron heads, and a 750 cfm Holley with the Proform main body. And the car wanted MORE fuel! Borrowed my buddies 850 and the car picked up. IMHO The intake is the problem here, not the carb.
No, the vacuum port on the back doesn't HAVE to go anywhere. You're just fine with it plugged.
