Is there 302 engine conversion kit for a 1989 Bronco 11?

No, there isn't a readily available, off-the-shelf "conversion kit" to swap a 302 cubic inch (5.0L) engine into a 1989 Ford Bronco II. The Bronco II already came with a 302 as an option in certain years and trim levels. If your Bronco II *doesn't* have a 302, it's because it originally had a different engine (likely a smaller V6 or a 4-cylinder).

Swapping in a 302 would require a significant amount of custom fabrication and sourcing of parts. You wouldn't find a single "kit" for this. You'd need to find a donor 302 engine and transmission, address the differences in engine mounts, potentially the exhaust system, wiring harness, and possibly the cooling system. The transmission may not bolt directly to the Bronco II's existing transfer case. This is a major mechanical undertaking, not a simple bolt-on conversion.