I run the 440 M Code Cuda registry. I took over from Dave after he passed.
On top of what was already mentioned is the kick down rod that goes down the backside of the firewall is different than 383, Carb, trans, trans torque converter, wire looms, heater hose bracket, valve covers, distributor, on the fender it’s 440 over the ‘cuda. On the 338 car the ‘cuda is over the 383, pie tin and Horsepower. That’s all I have off the top of my head.