After the Cleveland V8 powering this Pantera blew in 2009, the change was made from Ford to GM power. They choose a LS376/480 crate motor and it worked nicely until the desire for more power crept in. In 2013 they decided a supercharged LS9 would be the best option. There were several bugs that needed to be worked out such as moving the engine/trans back 1 inch and down 1.5 inches to provide room for the supercharger and front accessories. The engine is controlled by a MAST ECU which should help produce around 575 horsepower to the wheels and is connected to a ZF transmission via a SPEC flywheel and twin-disc clutch.
Source: ZR1 Pantera