You will need to make some modifications to the transmission in order to install it on a 350 engine. These modifications include:
* Replacing the torque converter with a converter that is compatible with the 350 engine.
* Replacing the flexplate with a flexplate that is compatible with the 350 engine.
* Adding a transmission cooler to help keep the transmission fluid cool.
Once you have made these modifications, you can install the 700R4 transmission on your 350 engine. The transmission will bolt up to the engine in the same way as the original transmission. You will need to connect the transmission lines and electrical connections, and then fill the transmission with fluid.
The 700R4 transmission is a great choice for a 350 engine. It is a durable and reliable transmission that can handle the power and torque of the engine. It also offers improved fuel economy over the original three-speed automatic transmission.