There are limit less Engine options available for Corolla 81. You can even go for V8 but careful with Speed and Car Strength. Many In-line Straight 6 or V6 with Turbo will fit. By the way In-Line Straight 4 1.8 Liter is best.
My personal favorite is TOYOTA CHASER SUPRA 2.5L TWIN TURBO ENGINE MANUAL R154 TRANS ECU JDM 1JZ-GTE 1JZ
