If you're looking to convert a GM truck and want to utilize the GM transmission, you should check out this auction. I am not affiliated with this in any way, I just stumbled across it while searching for parts, if they're crooked, please don't shoot the messenger 
Good luck if you bid on it. I personally would be hesitant to use a GM automatic in any model or modification. The flexplate will swap out for a flywheel without any other parts needed the starter is the same for bot auto and manual. (flywheels are not cheap, but much less than the money you'll waste trying a GM slush box behind a b series).
http://cgi.ebay.com/ebaymotors/ws/e...0026758169&category0=&fvi=1&item=190026758169

Good luck if you bid on it. I personally would be hesitant to use a GM automatic in any model or modification. The flexplate will swap out for a flywheel without any other parts needed the starter is the same for bot auto and manual. (flywheels are not cheap, but much less than the money you'll waste trying a GM slush box behind a b series).
http://cgi.ebay.com/ebaymotors/ws/e...0026758169&category0=&fvi=1&item=190026758169
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