Probably not, the Mark VIII engine is wider than the 5.0 that was in it. It is also taller. The 4.6 SOHC is wider than a 460 cu.in.!!!!!!! The 4.6 DOHC like the Mark has is even wider than that! You MAY squeeze it in there, but I doubt it could happen.
14.08 @ 98 mph
NMRA MM # 7073