I have found a never used 5.7 crate engine with this code. I am not sure if it is ZZ4, but I think the heads are iron. This motor is still in the crate. I have a 1995 TBI 350 Chevy truck. Will this motor work with my intake/TBI injection? It is a single rear seal motor. What HP should I expect. Thanks

That block was used for a lot of different crate engines. From ZZ4's to stock replacement vortecs engines. I would run the numbers on the heads to get a better idea of what it is.