Will a 1997 Camaro 350 fit in 1994 Camaro?

No, a 1997 Camaro's 350 (likely a LT1 or LS1 depending on the trim) will not fit directly into a 1994 Camaro without significant modifications. While both are Camaros, the chassis and engine bay dimensions changed between the fourth-generation (1993-1997) and the third-generation (1982-1992) Camaros. The 1994 is a third-generation car. The engine mounts, accessories, and possibly even the firewall would be incompatible. A major engine swap project would be required.