That was THE swap to do on a Gen 1 back in the day.
What actually that was back in the day,,, was FrankR ( on 4x4WIRE)used Diamante block for his Supercharger project because it had boses on the block that added strength to block.
The 93-94 Diamante SOHC 6G72 had 10:1 compression and cams are timed to put power band at higher RPM .
I don't no if ECU will work properly.
Good luck and let us know about ECU compliance.
92-98 Hyundai Sonata used the same compression and cams timing as the 89-94 Montero.