LS1 engine mounts no LT1 engine mounts yes, aftermarket fuel injection systems are out the(FAST, Big Stuff 3, Accel) the heads will work fine you just need an intake it injector bungs welded in and a throttle body. the set-up he has there would be more horse than an LS1 but he didn't say what the compression was. depending on compression i would say that engine is looking at 450-550 horse. and if its real high compression could be close to 600.