Ok, picture 1, brass nipple is for the hot air source and since you don't have your truck listed I have no idea what engine you have. 302 and 351W will have the choke stove (hot air source) in the right side exhaust manifold. 351M. 400 and 460 the choke stove is in the itake manifold.
Picture 2, that is for the electric choke heater, if it is the normal Ford one it is designed for 7 volts DC from the alternator stator (S) terminal.
Picture 3, I always tuned my carburetors by ear, even synchronising 4 Zenith-Stromberg CDs on a V12 Jaguar. Those are the idle mixture screws, in = leaner, out = richer. If you live in an area with emission testing, a meter is going to be the best way to adjust them.
Bill AKA "LOBO"
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"Getting old is inevitable, growing up is optional"
Darth Vader 1986 F350 460 converted to MAF/SEFI, E4OD 12X3 1/2 rear brakes, traction loc 3:55 gear, 160 amp 3G alternator
Wife's 2011 Flex Limited
Daily Driver 2009 Flex Limited with factory tow package
Project car 1986 Chrysler LeBaron convertible 2.2L Turbo II, modified A413