The 4G63/G63B engines built mid 80's are narrow block. The best way to figure out if you have narrow or wide is a tape measure across the the 2 transmission mounting bolts opposite each other at their furthest point. I don't know if Bill is a member here (sort of doubt it) but if you google his name you will find him no problemo. He has a lot of experience with transmission adapters and knows his way around Mitsubishi gear in a way few others have ventured.