Don't use a particular engine just because you can get one for cheap/got one lying out the back of the shed/mate sold me one for a case of beer. The money you might save in buying the engine will be mere pocket change in comparison to the costs of trying to marry up an engine, gearbox and drivetrain from a completely different MAKE of car, let alone model. As everyone else has said, something like a 1GGTE would be a much wiser swap, plenty of people have done them successfully in the past and they put out good enough numbers to keep you satisfied (and if you're not satisfied with that kind of power, then chances are you wouldn't be doing a conversion on a Corona in the first place).