If you're going after a 700, make sure that it's an '85 or later model. The early ones have a weak pump. If you do get an early one, the pump can be upgraded, though. There also is a lenght difference, 2" I think, so you will have to shorten the driveshaft. You'l also have to add a throttle valve cable from the carb for the kickdown. Other than that, and moving the trans mount back a bit, it should be a relatively easy swap.
