Tuning a Proform/Holley carb, what parts and tools?

KnuckleDuster said
Also, I noticed while checking the t-port the slots are elongated even with the idle screw backed all the way out. Does that suggest the throttle blades are clocked wrong or not closing all the way?

Yes it does. Also check the fast-idle and choke linkage to make sure they are not keeping the throttles from closing completely.