I am getting ready to start on another Duramax conversion on my 79 Airstream Motorhome. It currently has a 502 with T400 with a gear vendor. My engine is getting tired and decided to consider the upgrade to LBZ 6.6 since I have smog this MoHo in California. It sucks I know but that's the rules. My last conversion was mostly sheet metal work and making things fit, I am open to any ideas or pointers that any of you can give me. We have a complete fabrication shop so we can most anything work, its just metal right! It looks like it should fit nearly in the same place at the Big block and T400. I seem to have pleanty of room. I do have to smog this unit when its over per California requirements.