I had this exact same problem last month on my '78 T/A, when I went to install a completely new th-350. After many hours of head scratching and the use of progressivly larger hammers, I finally figured out my problem. The splines on the driveshaft yolk had become twisted down towards the bottom. This resulted in it not slipping on the new tranny(because of its non-mangled tailshaft splines), and my driveshaft being about ¼"-½" too long. I ended up digging out a spare driveshaft, and everything went together fine. Hope this helps save you some aggrivation.
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