I assume you plan or want to ride in the Manx GP ?

It's a little tricky getting the right race licence to do the Manx GP if you are from outside the European Union it can be done just not starightforward.
Anyway heres the Manx GP website

http://manxgrandprix.org/

If you go to this page and scroll down you should be able to download the 2008 regulations for the Manx GP

http://www.manxgrandprix.org/Classic/ClassicC.html

and within the regs and other documents on that page you will find information about the Classic classes including machine eligibility.

Hope that gets you started