I don't see how that would work since the torque converter is still bolted to the flywheel. I just don't think there is enough room to swing the motor to the left enough to pull the converter out w/ the motor while leaving the trans in the car. I could be wrong, but even if I am, do you
really want to try and get the converter to set in the trans correctly with it in the car? I sure as heck don't, lol...
I would pull them as a unit. It's not that hard. And yes, it can come out the top this way. Just remove the hood to give you room, GENTLY move the plastic fuel lines out of the way, disconnect all vacuum lines and wiring and out she comes. Just take it slow and watch the ABS and brake booster on the drivers side as the trans may try and catch it, and be carefull that you don't smash the backside of the radiator.
My guess is that the lower intake manifold gaskets failed and poured coolant into the oil thus ruining the rod bearings. It's a common issue if not caught in time. You'd be best to find a used motor for $500 or so and just swap that in. You can re-use your accessories and whatnot. If you plan on rebuilding the stock one you will need all new rod and main bearing cap bolts as they are TTY bolts (1 time use), line bore the block, turn the crank, and a slew of other things that makes it not worth the effort or $$$.
No one will care if the car is "numbers matching" when it gets sold. Like was stated these cars are dime-a-dozen. Even the GTP's. Just trying to help save you time and $$$ and get another GP back on the road
