I've dealt with and have seen various fires over the years. Most of the plastic is intact so I'd call the fire pretty small. ( Air cleaner duct , heater case, battery , master cylinder reservoir, wiring and of course the source of the fire.)

To fix you will need a complete parts car sitting in the next bay. The real question is if the firewall paint is burnt, if it is, the underdash area may be as well. The repair is more labor intensive than difficult so be sure your time is worth the labor. To get rid of burnt plastic smell, use mineral spirits / lacquer thinner to remove smoke from surfaces.

These cars were made for 18 years so the pool is large to draw from, so don't rule out finding another car with a bad motor, hit front and blending the two, ( in either direction )