I personally like a 4bbl carb.
There was a recent thread -
https://classicbroncos.com/forums/threads/intake-and-carb.316600/
As I said in the thread - I played around with a couple combinations; very happy with a 60's iron FoMoCo 4bbl intake and a 390 CFM Holley. I would love a FoMoCo aluminum intake, but have not found one.
Mine is not a garage queen and sees many types of driving (rural, urban, highway, camping) every year and I average a little over 8000 miles per year.
I think 400-450cfm is the best size.
As stated above, you may need a quick tune-up and should be done even if you do not go 4bbl. The stock timing settings will not thrill anyone.
A good set of plug wires, new plugs, confirming the vacuum advance and weighted advances are working and setting initial timing to around 10deg BTDC and confirming good manifold vacuum at idle will be a decent baseline.