Will a turbo 350 transmission change out with a700 R?

Yes, a Turbo 350 transmission can be swapped out for a 700R4, but it requires some modifications. The 700R4 is a more complex transmission with overdrive, which means you'll need to address differences in the mounting points, driveshaft length, and possibly the transmission crossmember. Additionally, you'll need to account for the electronic components and adjustments for the kickdown cable. Overall, while it's feasible, it may require significant work to make it fit properly.