I just bought 1996 Mustang
Convertible with 3.8 & AT setup from the factory...the car came striped without engine or tranny
. I am new to the Mustang project...... i would like to put the 1999-2004 V6 3.8 engine with 190hp or 193hp with 2000 ECU put in since it produce more horse power than 1996 150hp. I need help as much as possible. How much work do i have to do to put a newer engine to the 1996. Since a newer engine does not require the return gas line...do i have to get a newer fuel rail? my biggest concern is that do i have to swap the new wiring harness in the car, fuel rail, etc....? The newer engine comes with the engine wiring harness.