87 3.8 cfi to 03 3.8 EFI April 28, 2019, 10:46:52 AM I've got an all stock 87 T-brid 3.8 CFI last year I put new timing chain on it and rebuilt the CFI unit. The car runs much better now. Recently My son Purchased a 03 mustang 3.8 that needs a new engine. We are in the process of an engine swap. I will have a complete 03 3.8 to play with. Currently it runs but has a very bad shake to it and has broken a piece of the oil pan. I wonder if the heads from the 03 would bolt onto the 8.7 bottom end so I could use the newer style EFi setup. Yes I know I would need the harness and ECU to make it run. Just thinking of a way to get more power in the 87 3.8 with parts I will have on hand.