On these early cars, to me the most difficult thing is getting the condenser squeezed in between the front of the radiator and the hood latch/vertical latch reinforcement. These cars have little to no room in this area, though a Lancer is slightly roomier than a Valiant due to it's pointed snout. I know it can be done as slantsixdan's conversion and one other I saw at a car show attests to. Pretty sure some cutting/modification will be required in this area.