have fun rebuilding that engine. not to discourage you, but i changed the oil pan gasket on my 86 GT and it was no picnic. i had to drop the exhaust, take out the starter, take a plate off the trans, un-bolt the engine from the frame, jack it up, and the finagle the pan out. it was really a pain. if you do decide to do it, i suggest just taking the engine out.
P.S. Have Fun!!!!!