Do you have a good 4180???
Because emissions compliant carbs are expensive and hard to come by without a core.
I ran a 0-80457-S 600 cfm Holley on my truck for years and really liked it!
I gave it to another member for their '79 Ranchero a while back.
If you don't have all the emissions, like the charcoal canisters and associated vacuum valves and switches I would forget about a 4180 and go with a generic Holley or Edelbrock in the 5-600 cfm range, or the Summit branded Autolite clone.
They're all good carbs for a pickup or Bronco.
Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.