86R Frame...Which Engine?

[Psyonyde]

I found a cheap 86 R frame, and I also found some motors that I was wondering might fit it. The motors Are:
'78 DT250
197?? DT250
'79 XR185
'81 Virago 750

I know these arent the best choices, but they are the most "budget efficient" ones that I could find. Does anyone know if any of these would fit the frame with little hacking/modifying?
Thanks

[Highway420racer]

The Dt250 motor might fit

[thefox]

I am pretty sure that the Yamaha Virago 750 engine will not fit, the xr 185 might if you are going to put an engine in then you might as well go BIGGER :evil: !

-Andrew