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pick up a chiltons repair manual for you year car at the library.
Back in 66 and 67 the sister car was the coronet but in 68 the charger took on it's own identity.
If that 66 Mustang still has the original ignition system and the wire feeding the tach from the negative side of the ignition coil is shorted to ground, then yes the car won't run.
my 66 charger had seat belts front and rear, don't remember if they were standard equiptment or an option back then.
yes they should fit on the front but not sure on the back, you might need air shocks on the back for them to fit.
#1, a 66 coronet never came with a 440 so someone must have installed it, make sure the radiator is large enough to handle the 440 if your having heating problems, you want that engine to run 190 degrees on the open road and not much over 200 in traffic.
code 66 is a non specific communications failure between computers
diagram colors to conest ignition switch
66
A 66 Mustang regardless of engine doesn't have an ignition module from the factory. It uses breaker points inside of the distributor housing to directly control the ignition coil.
66
66