Matt,
The required work experience hours for level MT I is 70 with a total hours in NDT as 130. The required work experience hours for MT level II is 210 with a total hours in NDT as 400. This is from the 2006 Edition of SNT-TC-1A. You may want to check your employers written practice because that is what you will have to live by for your particular circumstances.
As far as counting 200 hours in VT, it is possible, but then again it should be stated in your employers written practice. You should be talking to your quality manager or NDT Level III to get the correct answer for your situation. You will get alot of answers on this forum, however, each employer has its own written practice that is taylored to their specific needs.
Hope this helps,
John