Cheap temp 4bbl carb via junkyards for sl6?

Superslant I like Eddy 140X carbs so any Carter would be fine. A small Holley should be easy to fine as well. Look for a V8 A body for the cable conversion parts and take pedal to the carb. Use a Lokar or Buchilon (SP) cable to do your kickdown. On your 63 you dont have part throttle kickdown so it will be easy to set up. A note on carbs....since you have a slant I would try and find a Vac sec carb so it only opens as much as is needed or it may be terrible on fuel economy.
Frank