I need to know if there are any differences in these 3.8 engines?Is the 3.8 from a 90-91 T-bird non sc the same as the 3.8 from a 94 mustang?If they are different what is and in which engine?Thanks .I want to put the t-bird motor in my mustang as mine is really rattles at high rpm and on start up.Sounds like a wrist pin but fine when idleing and if you drive it like a granny lol.