Challenges:
* Dash: The 1979 dash is significantly different from the 1985. It will require modifications to fit the 1985 body. This could involve cutting, welding, and possibly custom fabricating brackets.
* Wiring: The electrical systems between the two years are different. You'll need to rewire the 1979 interior to match the 1985 wiring harness.
* Door Panels & Seats: While the door panels and seats might physically fit, they might not match the 1985's interior design.
* HVAC & Gauges: These components are not interchangeable and will need to be replaced with 1985 parts.
Things to Consider:
* Cost: This project could be costly, requiring specialized tools, materials, and potentially professional assistance.
* Complexity: It's a major undertaking, requiring significant mechanical and electrical knowledge.
* Availability: Finding parts for a 1979 interior in good condition might be difficult.
Alternatives:
* Restoration: Consider restoring the original 1985 interior. There are many resources and suppliers available for this.
* Aftermarket Seats & Upholstery: You could replace the original seats with aftermarket ones and reupholster the door panels.
* Custom Interior: If you're really aiming for a unique look, consider a complete custom interior.
Recommendation:
Unless you have extensive experience with automotive modifications and are comfortable with complex electrical work, it's likely not worth the effort to try this swap. It's better to explore other options that are less time-consuming and cost-effective.