its a little more than an engine swap but if you wanted to go with a 2.4l fuel injected from the 1990+ trucks you can swap that in. you would need to swap the wiring harness, ecm, MAF, and install a high pressure fuel pump. everything is really straight forward, just takes some time. if you want to be as original as possible you can go with a 2.0 wide block from the 1989 and down. you will find these in the automatics.