Any info on this ambulance?

[PushnFords]

I'm looking for a truck to restore as a shop project...something I can use as a parts runner and take to car shows as advertisement. A coworker told me about some old trucks his dad has so I went to take a look and found this ambulance. It looks mostly complete and untouched since it was sold by wildlife and parks - still has the cots in the back. I know it probably isn't as valuable as a Suburban or truck would be but it stands out enough. Is there a plate on it somewhere that tells who did the conversion? Are period correct lights hard to find for something like this? It is pretty rusty....pretty much everything on the bottom foot of the body has holes...but looks like between truck and burb patch panels I could probably find what I'd need? What is this thing worth?