Technically speaking, the cam shaft doesn't have a TDC position. This
term applies to the crankshaft when the #1 piston is all the way up and
the valves are closed for that cylinder. The cam gear on your car has a
pointer or arrow cast into the webbing of the face. This should be
aligned with the mark on the head behind the gear. When the cam is in
that position, both valves are closed for the #1 cylinder. If the crank
and cam shafts are aligned accurately on their respective marks, there
can't be any phase error (180-deg) between them. Unlike older cars with
a mechanical distributor, the ignition system on your car fires the
plugs on every revolution of the crank because it gets it's timing from
the crank sensor not the cam shaft. The fuel injectors get their timing
from the cam shaft sensor. It doesn't affect the engine performance to
have the plugs firing on the top of the exhaust strokes in addition to
the compression strokes. I've wondered if the plugs wear a little faster
though.

Be sure to keep the belt taught on the forward (straight) side before
releasing the tensioner. This will insure that the belt won't skip on
either gear when the engine is started. It's best to crank the engine a
few turns without starting it, so the belt can seat properly. You can do
this on your Tracer by holding the gas pedal all the way to the floor
before and while you turn the key. The car's ignition system is designed
not to fire the plugs in this situation. It's a feature for clearing a
flooded engine. Did you also change the water pump? This would be a good
time to do it. I would also change the belt tensioner if it's never been
done.