Thanks for the advice guys! I asked about the transmission because I found this item:

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=006&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=160070494514&rd=1

Will this fits a 617 for sure?

I already have the factory 4-speed attached to the 617, so I could use that flywheel and clutch compound.