Hi Fred...nice looking early Barracuda. I see you live in Clifton, VA., which is not far from where I live in Front Royal, VA. I own a couple of early Barracudas too.
I looked at the build sheet for your car and found a couple of interesting things that you may or may not have known.
Your car was built/ordered with: ("000" means found on build sheet)
Heavy Duty torsion bars-- "892" and "893" on buildsheet (same as Formula S)
Heavy Duty rear springs-- "804"
I find it interesting that your car had Heavy Duty bars/springs but did not have a "368" Rallye or HD suspension package.
Your car was built without a sway bar and came with standard duty F&R shocks. "45/00".
Seems kinda odd, but in 66, a person could order a new car with most anything you wanted.