they came in legacy's and Impreza 2.5 and foresters from a certain year. and if you can find a phase 1 dohc from the 2.5 motor you wouldn't have to tap a hole for the starter if i remember correctly, like you would with a phase 2 head from a wrx or sti. and i kinda have a build like your talking about going on its just going slow due to funds but it will be fun once its completed