look right above the fuel inlet/filter, that's for the throttle, need a very small screwdriver, the other towards the back adjusts the choke.
I believe that one is either screwed into the carb or is very near the carb on the fuel line. Mark
Rotors
The Ford Ranger engine line-up for 1983 and 1984 was : 2.0 L - 4 cylinder 2.3 L - SOHC - 4 cylinder 2.8 L - V6 2.2 L - 4 cylinder DIESEL
Closest to the front of the vehicle
( .044 inch ) for your 2.8 liter V6 engine in your 1984 Ford Ranger , according to motorcraft . com
( .044 inch ) spark plug gap for your 1984 ( 300 cubic inch ) 4.9 L straight 6 cylinder Ford engine
The available engines that year were a 200 cubic inch 6 cylinder, a 289 cubic inch 8 cylinder, and a 302 cubic inch 8 cylinder. Assuming you meant a 289, your best bet would probably be to purchase a carb kit, rebuild the carb, and follow the instructions for adjustment. That should give you a baseline to work with.
1, 3, 4, 2
how do you remove the old carburetor form a 1984 ford f150 4.9
I was looking at the Ford parts website and it shows : For a 1984 Ford F-250 : ( the 6.9 liter / 420 cubic inch / 8 cylinder diesel engine was available )
advance your timing
The ignition timing on the 1984 Ford Ranger is : 2.0 L - 4 cylinder - ( 8 degrees BTDC ) 2.3 L - 4 cylinder engine - ( 6 degrees BTDC ) 2.8 L - V6 engine - ( 10 degrees BTDC ) unless engine compartment sticker shows different