Perfect. It looks like the lower mounting "channel" and the bracket that attaches to the block line up so that a single bolt passes through both the slot in the front timing cover and the block bracket.
It also looks like the pulley side face of the lower mounting channel and the same face of the upper threaded hole in the timing cover are "level" with each other... With my new DOHC engine, I'm looking into an AD244 alternator mounting solution that would outboard the alternator by about an inch out and down with the larger body/higher output alternator.
The AD244 alternator ran 160 amps stock in some trucks and uses the same exact charging circuit setup that the Fiero does. It was also designed to have a higher output at a lower RPM since the truck engines tend to idle about 250 RPM lower than most of the V6 engines.