If you want to put a T56 on your old style block and use your stock flywheel and clutch then goto www.weirhotrodproducts.com to check out their T56 swap kit... I've gotten one.. it works better than hoped for.. quality above and beyond my expectations! I've dealt with allot of companies over the years and have never been able to get intelligent informative answers AND products that work flawlessly as described!
Very happy customer here!

My .02 cents.. hehe Enjoy!