Yes @gtti is right Mitsu. engines fit the best with little or no modifications. And I would not go for a 4G63T rather get the 4G63 non-turbo version and has plenty of power to blow any altis, vti or anything else. Or betteryet go for 4G64 its a 2.4L came in the galant. Even the 4G63 came in earlier galants.
Here is the choice of engines from Mitsu. that can fit
4G62 1.8L SOHC
420A 2.0L DOHC
4G67 1.8L DOHC
The 4G bread of Mitsu enginesis the strogest engine ever made, better then any 4 banger out there.