250R/200x question

[Rexall]

I have a 1985 250R with no engine, will a 350x engine fit or something cheaper than a liquid cooled 250R. Also have a 85 200X that I want to make look like a 250R or 350X. I have seen one with a 350X front end, what else will work? Maybe parts off my 250R?

[wanta250r]

I think you can put a 350x or 250r headlight on a 200x