Could someone tell me whether or not the 5.4 motor is interchangable with the 4.6 mustangs? A customer is looking to replacing the 4.6 due to engine failure and was asking about the 5.4. If I'm not mistaken the 5.4 is the same bore with a different stroke. Are there any issues that need to be addressed before the swap? I dont know much about the 4.6 stangs and am looking for info. as to whether or not the swap is possible. Could someone give details about what is different for future reference? Thanks