From what I found at Wikipedia: (http://en.wikipedia.org/wiki/Pontiac_Firebird)
"Curb weights rose dramatically in the 1973 model year due to the implementation of 5 MPH telescoping bumpers and various other crash and safety related structural enhancements; SD455 Trans Ams tipped the scale at a whopping 3,850 pounds curb."
No
4,800
2420 lb
4800 lbs
Yes it has one
Police Story - 1973 Firebird 3-18 was released on: USA: 6 February 1976
It weighs 4,640 pounds.
3800-4000 lbs
12000lbs.
I'm fairly sure that the 70-81 windshield is the same dimensions.
the bird dude
150 to 175 hp