Is the 66 289 SJ negative battery cable mounted to the engine block same as the 67? I found this one mounted on the front of the cylinder head. I would assume the alternator ground is in the same place.
The battery ground (aka negative) and the alternator ground are attached by a bolt (or a stud with a hex head drive in the middle, for AT cars, no known Ford part number, I used "UNK-02" in the spreadsheets), 20350-S36, and a lock washer, 34943-S36, to the a 289 block under the alternator.
It should be the same as 1967 Mustangs. The "stud" was introduced for early 1966 Ford 289 engines.
Lastly, is the coil mounted to the right side of the intake with TE, AC and PS? I found this one on the left side cylinder head.
On my 66 San Jose Hardtop with smog and PS, the coil was mounted on the RH side to the intake manifold. To be truthful, it appears that the coil went anywhere it would fit on a car with multiple options.
Jim