Clifford makes an adaptor, but the 1.21 (intended for small v-8) will be too big for a 200 with the stock intake hole. The 1.08 (from a mustang 2 v-6) is a better choice, although with the adaptor it was too much for my 170. My adaptor does not fit my new big log head- I'll let you know if I don't sell it to a guy in my club. I think he's coming to look at it this weekend.
Sedanman