Can you put 98 vortec 350 heads on a tbi motor?

No, you can't directly put 98 Vortec 350 heads on a TBI (Throttle Body Injection) motor without significant modifications. The biggest obstacle is the differing intake manifold bolt patterns. Vortec heads have a different bolt pattern than the TBI intake manifold. You would need a custom intake manifold or adapter plates, which are not readily available and would require significant fabrication.

Even if you solved the intake manifold issue, other challenges remain:

* Valve Train: The Vortec heads likely use a different rocker arm setup and possibly valve springs than the TBI engine. You'd need to ensure compatibility.

* Exhaust Manifolds/Headers: These will likely also need to be replaced to match the Vortec head ports.

* Computer/ECM: The TBI system's computer is not designed to work with the Vortec heads' flow characteristics. You would need a standalone engine management system.

In short, while theoretically possible, it's an extremely complex and costly undertaking. The effort involved would far outweigh the benefits, making it impractical for most people. It's much simpler and more cost-effective to find a suitable set of heads designed for the TBI engine.