The EF alternator fits better with an alloy cortina mount,the best combo that I have found is the late cossie mount with the VL Bosch unit...being perfect without mods other than the pulley change.
Below is the EF style Bosch unit on a 2L Cortina bracket...fits but is a mix and match.

Top Centre in the below pic is an alloy version of the late Cossie bracket, I have a modified original bracket which is steel if your interested,it has been modded to lower the alternator by about 10mm.I have a vbelt pulley to suit a Bosch alternator as well if thats what your running.