Richard,
I too am converting to 40's after an engine rebuild this winter. Here is a bit of help/direction from Toby in Seattle. See the link.
http://www.bmw2002faq.com/component/option,com_forum/Itemid,50/page,viewtopic/t,348374/highlight,/
It is Delta camshaft. My son lives near there so I can have him do mine, but they said that you can ship them a cam and for the money, I think Toby is bang on. They seem really easy to deal with too.
http://deltacam.com/
HTH
Russ