I have a jdm non vtec d15b motor, and a salvaged d15b7 motor/tranny. with a 93 ex shell. now my question is, are they fully interchangeable? and what are the fine little details that i'm going to have to watch out for? i plan to get down on it sometime next week. so i'm hoping to get some insight. I understand that all d series are interchangeable, i'm just making the effort to make sure. thank you!