On a basically-stock compression/cam, I'd go with a good brand-name (or made in USA) coil for a '78 Fairmont.
Or there's this info from IgnitionMan, a good source of ignition info on several other boards:
GOOD COILS:
MSD Blaster II chrome coil, p/n 8200
NAPA IC12 black coil, same coil as MSD 8200 (NOT IC12 SB)
Summit G5215, same coil as MSD 8200
CarQuest 26189 black coil, made with the same specs as MSD 8200.
NOT GOOD COILS:
Blaster II RED coils 8201, 8202, NO, layer shorting issues, made in Mexico, problem prone
Accel 8140, 8140C, 8145, 8145C, NO, Taiwan made, problem prone.
Mallory, any.
I've been using a NAPA IC12 coil on my high-compression and cammed Buick big-block for a couple of years now with good results.