Quadrajet Replace or Rebuild

[72C20Highlander]

I've got 72 C20 with 402. Only 59,000 miles but such little us over the past 10 years carb seems to be maybe gunked up. Won't idle very smooth, runs down the highway fine though. Truck is super straight and clean, Orig. except tires, exhaust,shocks, spark plugs and wires. Should I rebuild Orig. card or is there a much better performing replacement I should use that will accept factory air cleaner etc.