Orange
Although you haven't really asked anybody's opinion on the whole car, I'm going to offer mine because I'm a huge 1971 Cuda fan, I've owned several, sold several and restored even more. I'm constantly watching the market on these cars.
A fully OE restored 340 4spd with all documentation, tags, etc...with the options and colors yours has would be worth $65K-$75K tops. YES people are asking more, but I doubt very much they're selling for anything more.
Your car being "fully restored" with several personal changes being made along the way, makes for a very awesome looking car HOWEVER...you've scared away any big time potential "investment collector" , the type of person who has that kind of disposable income to buy a top dollar 340 Cuda. Most simply wouldn't be interested because the original numbers matching 340 is gone and a 360 takes it place.
What you created is more of a modified car or "resto-mod" WHICH there is a huge market for these days. When viewing the car with that in mind, most people will quickly realize you couldn't build a car of your quality at the asking price you're at. However in my opinion most potential buyers for a car in that category aren't looking to spend that much with the limited mods you have done....they're more in the $45K-$50K range.
So to sum up MY OPINION and it's only an opinion, like arseholes, everybody has one.....
Changing a few things back to "stock" (engine color, wheels, etc...) will not get you the OE resto prices you want, in fact if you brought it back 100% to OE stock, it still wouldn't bring top dollar because of the numbers not matching.
I think you continue to modify the car to suit your own taste, drive and enjoy it, or leave it as is and continue to try and sell it. A couple of times on EBay (with a high reserve) will give you an excellent indication of what the world's buying public is willing to spend