Rebuilding a 700r4

[Russell]

Hey fellas, on a scale of 1 - 10, how tough is it to rebuild a 700r4 tranny? I wanna beef it up a bit so it can take my 355 later on (300 - 350 hp, and 350 - 400 ft lbs of torque is what I am aiming for)

What all is involved with this, and do you think that a kid like myself could do it? The tranny I am getting worked when it was removed minus a bad front seal, but it has a lot of km on it, so I would like to rebuild it right away.

Also, I seem to have a longtail TH400 (if such a thing exists, just a heck of a lot longer than the four speed granny I have) so would I need to get a new driveshaft as well?

My father knows a guy who owns a transmission rebuild shop who would likely be able to get me fairly cheap parts for it, so I'm thinking it may be worth it..