99 silverado 4.3 to 5.3

[minibike]

My son's truck had a rod bearing go out (4.3). We are trying to figure out whether to put another 4.3 back in, or get a 5.3. Is the transmission and torque converter the same (auto), so we could reuse his. Is this a matter of getting the computer, wiring harness and fan shroud out of a doner, or is there much more to it. Will the exhaust bolt up? Air cleaner? Has anyone done this swap?

Thanks,
Greg