T-56 in 70 Chevelle, I need tips!!

[wade70ss]

I'm running a 1-piece rear main 350 and TH400 in my 70 Chevelle. I have a LT-1 T56 including flywheel, clutch, pressure plate, and belhousing that I want to put in. I also have the stock Chevelle clutch/brake pedal installed on the car. I know this trans will bolt right up to the motor I have, however what else do I need to make it work? I've heard about flipping the TH400 mount on the trans crossmember, cutting the floorpan to make room, shortening the driveshaft, and TH350 yoke.

But what is necessary to get the clutch master/slave combo in correctly? If you've done the install, tips/photos would be nice. Do I need to change my starter, is balancing the motor a must if I just daily drive it? Any and all suggestions are welcome.