Just fyi in case you don't know, air shocks on a unibody car are not the best idea. Been reports of lots of problems with the mounting point on the body not holding up. At least in the vintage Mustang world. Maybe the Pinto is reinforced in that area?
Might be ok, but just something to think about.
I can't imagine it costing $1200 installed. Can you check around with other places?
Russ