Mike, with a quick google search, here is a link I found for SM420 rebuild kits
http://www.novak-adapt.com/catalog/sm420_parts.htm
http://cgi.ebay.com/ebaymotors/CHEV...intage_W0QQitemZ8068708421QQcmdZViewItem
http://www.drivetrain.com/munciesm420.html

I am sure that there are many more.

The T5 will bolt up, however is longer than the SM420 and will require a trip to get the shaft shortened. The consensus is out on the rear mount.

The problems we face today can not be addressed at the same level of intelligence we were at when we created them - Albert Einstein Or with the same level of $ - Me