Carb and Choke Q's

I've got a screw missing on the carb..maybe two...I got a rebuild kit for the Rochester 1975 Vette carb, and it looks like the screw is correct...so that's cool...my Vette runs pretty well, somewhat ragged, but if i know anything(which i don't really) that is caused by the bad spark-plug wires that I have. Should I try to clean and tweak the carb or leave it alone, add the hold down screws for the choke and change out the S-P wires?

Scot