so my 1998 exbo with 325000 still running my need a new motor maybe . so I want to know if anyone has used or implanted a 3 valve or 4 valve in a 1998 exbo. I have seen adapter plates to us different motor. I'm not sure of any of that though. when I was thinking of stroking a 4.0 jeep I had all the info needed. but have not came accost the right info for 5.4 conversion . need some one that has done this.