If you can get the engine wiring harness from a gtp of your year, it's easier than adding pins to the pcm for the l67 MAP sensor not maf, mafs are the same.

Doing valve springs is easier out the car. Oil pan gasket is a good idea, get the main seals too they are pretty easy to do with motor out. Take the timing cover off for the seal and put a new chain and tensioner in. These aren't a must but you know while it's out..