* Different Engine Families: The 1994 350 is a small-block Chevy, but it's a later generation (likely a TBI or possibly early Vortec) with a different block design, bolt patterns, and likely different oil pan and intake manifold configurations than the small-block Chevy in your 1975 truck. The differences go far beyond just bolt-on parts.
* Computer Control: The 1994 engine is likely fuel-injected and computer-controlled, requiring a sophisticated wiring harness, computer module (ECM), and sensors that aren't compatible with your older truck's systems. Converting it to carburetor-based operation is possible but a major undertaking.
* Transmission: The transmission bellhousing bolt pattern is different between those engine generations. You'd need a new transmission or adapter plate.
* Accessories: The alternator, power steering pump, and other accessories likely have different mounting locations and may not be directly compatible.
* Exhaust System: The exhaust manifolds and system will not fit.
While some parts *might* be interchangeable (like some internal components), the core engine block and its associated parts are fundamentally different. The cost and effort to adapt the 1994 engine would likely exceed the cost of a suitable engine for your 1975 truck, such as a rebuilt or used engine from a similar year. It would be a much simpler and more cost-effective project to find a more compatible engine for your classic truck.
