A 250 would require mount and other drivetrain mods to fit. It can be done. The question would be how much work do you want to do? If you don't mind doing the changes required to do the 250, by all means go for it. But if you're looking for an easy bolt in that keeps the balance of the original trans/rearend and the original look, then the 235/261 is the one to go with.
Do some more research on the links page before you decide what to do, that way you will know what you'll need for either engine.
