put a 4age into it. if your not going turbo it should be easy with no tunnel mods and alot less sump/oil pick up modification. smallport would be the go and even putting in a hydraulic clutch isnt that hard. 4ages go great rev like there's no tomorrow and well 4age inside is where its at.
ive got a bluetop sitting in the shed with a rwd intake on it thats up for sale. if you tilt the engine on a ever so slight lean towards the passengers side and redrill and drop the brake master cylinder bracket it will clear everything easy. wiring for them even with the standard ecu isnt that bad and you can pick up easy to wire in looms off trademe for cheap. so many things you can do to get easy extra power out of them and theres always the option of turbocharging later on with ze internals.