As far as the MkIV goes, the IMC kit more accurately represents one prepared by Hollmann and Moody. Main differences are the plexiglass cover over the two four-barrels and the side windows in the cockpit. H&M cars featured access windows that were hinged; Shelby cars had access windows that slid forward. The IMC kit needs a great deal of work in the engine bay. It would be best to kit-bash the IMC and MPC to come up with an accurate engine bay.