If I wanted a Toyota engine that was 2.0L, I'd go with the 3S-GTE. More available parts, it's gonna be lighter, still iron block and aluminum head, and they have great HP potential [late model 2G MR2s had 245hp] - plus, because of it's smaller size, you can push it closer to the firewall, making plenty of room in the front of the engine bay. The 3S-GTE has been used in JGTC Supras instead of the 2JZ-GTE for weight savings.. and yet you don't see any Skylines using SR20s instead of the RB engines. Chalk one up to the 3S, and Toyota!