Can a 92 350 block change to a 99 350 vortec?

Yes, a 1992 350 block can be changed to a 1999 350 Vortec, but it requires some modifications due to differences in design and components. The Vortec engine features a different intake manifold, heads, and fuel injection system, so you'll need to ensure compatibility with your existing accessories and electronics. Additionally, you'll need to consider the wiring harness and engine management system, as they differ between the two generations. Overall, while it is possible, it may require significant effort and parts to complete the conversion.