Holly or Thermoquad

Ahhh, yea, lean burn carbs will have to be modified. It would lack the vacuum port for the distibutor. There should be 2 screws for idle enrichment trimming on the base plate. Not all T-Q's have them.

the fast idle screw is on the side of the carb (Drivers) along with the screw for when the choke is active.

Running the DP isn't a problem. In order to fix the running rich problem would be the same for any carb, you'll need a jet kit from Holley. Also purchase a Holley screwdriver made for the jets. Nice little tool that'll just help keep the jets in excellent condition.

74scamp360's mention of the T-Q is, IMO, overly rated in scare. While a T-Q can be a pain to set up, it's more in the area of intail set up when building the carb, not so much when it's on top and running. Once it's on and running, it's like anyother carb really. Just a pain to change jets.