My 3.8 95 mustang threw a rod threw the block and therefor need a new motor. V-6's are hard to come by in my area, however I have found several 4.6's. Will these fit in my 3.8, the 4.6 comes with ECU, wiring harness, motor mounts, and the motor. How much trouble is it to switch motors like that and is there any other parts that I'm going to need.