Yeah what he said. ^
If it is pretty original and in fairly good shape, I'd mostly restore it but with some upgrades in the suspension to make it drive even better. Bolting on cuda trim isn't all that difficult to reverse but Signet trim and paint is something else.
Commando cars had that single large resonator coming out the back on the driver's side with the appropriate cut-out in the lower valance.
I vividly remember when I bought my first 67 cuda. It was a non-Formula S with a Commando 273 and a 4 speed. When the used car saleman first fired it up with me on the outside and I heard that exhaust, I couldn't wait to sign on the dotted line. Hearing that with the top down would be something.