fast, dependable, easy, possible? any details?

Checkout the following forum.

http://www.bmw2002faq.com

Search against m20 and you will get plenty of info.

Also checkout this site. Owner pulled the swap writeup, but will mail it to you.

http://http://www.bmw2002.co.uk/6into2.htm

Mine came swapped so I can't really discuss how difficult it is......though, I can tell you that it has been interesting trying to determine why/how the PO choose to wire/mount items in it.

testing