run the ALH (long block, IP, Turbo) with the AHU's injectors, wiring, ecu, pedal cluster, Maf and what not. I don't know if its been done but I know the mk4 VNt turbo has been used on the AHU and so has the IP.
the ALH is a much stronger engine, can take serious powerthe AHU pump will fit with a few modsim pretty sure the crank trigger is the same, not hard to find out, just look at it, if it isnt just change it for urs, i think they kept the same one until the PDonly problem you might find is mounting it in a corrado, let us know how it goesalso dunno if you are interested but if you use a BMM bottom end you can turn the 1.9 ALH into a 2.0 ALH with no modification