The timing advances within the distributor on all the earlier boxer engined alfa's, and I believe this is still the case for the 16v fuel injection cars, even though they run and ecu, I think this is mainly for the fueling and ignition control, but not the advancing.
try and stick a timing strobe light on the flywheel underneath the inspection cap, and rev it to make sure you see the further advanced marks come round, and if not, check the distributor for good clean health and all connections to and from it.
if it has been stood for a while or not used, it might be worthwhile a set of ignition leads, spark plugs, and a new distributor cap and rotor arm anyway.
if the ignition and advancing is healthy, and you get the throttle bodies well balanced, the other components that could be holding you back are potentially the air flow meter or the fuel injection system itself.
the air flow meters are a mechanical pressure flap, and these can be too stiff, and too light actually, and folk often mess with the spring tension on them in an attempt to "tune"the car.
the injection system may be suffering low fuel pressure for some reason, blockage, failing pump etc etc
a few things to check for you, but they are not overly complex so i'm sure you'll get to the bottom of it.