I am in Dallas where C class Mercedes are just as plentiful as F150's. I am very intrigued with the idea of the V8 especially after I found out the weight difference is very small. I wouldn't attempt this without having the entire engine harness and ECU. I did come across a bunch of C43 guys that swap out their engine for the C55 engine and have found they don't need to change the ECU. Just an easy swap.

I also discovered our automatic transmission is basically the same as the ones behind the V8's which may explain why SRT6's only came as automatics. There is only a small difference in the part number after the decimal point. Often this may mean only a minor difference such as the length of the tail shaft. I will keep checking this out but it looks like the stock auto trans can handle the torque.