I say yes it`s valuable
I`m no expert by any means but if your car is original has 2 tags heavilly optioned why wouldn`t it be valuable? Granted it not going to be as valuable as say a hemi. If you can confirm it`s 1 of 5 with that color scheme it would definatly add collectability to it. Out of the 5 maybe your is the only 1 left! I wouldn`t knock it "just" cause it`s a "74". Don`t believe all the hype that the 70-71`s get,awesome cars for sure but the 72`s to 74`s all have plenty to offer IMO.
Some collectors put down the later years lower compression,no hemi`s,oversized bumperetts, blah blah blah.That argument might be valid back in 72,73,74 when your buying it new off the showroom floor comparing them to the 70-71`s but not now.
Most of the cars that have survived are so far removed from being original it really shouldn`t matter.The ones that are still in original shape will have a premium over non-original or restored cars.
Oh yeah post some pics of your car and give us a list of the options it has I would love to see it!