3 Cents
When I did my car, I went back to the original color, which was black. (it was red when I bought it). I did this because I think Tigers look great in black, not because the color "had to be original." I narrowed the possible colors down to a
very short list.
Likewise with some mechanical upgrades: 1" front sway bar, 15" Panasports, 1.25" lowering blocks, Hurst linkage, pretty warm 302, alternator, electronic ignition, Konis all around, and a few other items. Cosmetically, I've got a bit of bling here and there including a Moto-Lita Cobra-style wheel with polished horn button, and some shiny bits in the engine compartment, and the replacement wood dash is complete with cubby door. Carpets are wool, top is black canvas. I
had to have the LAT style hood (CAT repro) and I fit the 3 scoops with black expanded metal mesh which finished it off nicely.
I wanted a car which was in the spirit of original, but which had the upgrades mentioned above. I also don't run the grille badge bar and bumperettes because I think the car looks a bit more aggressive that way.
Our Tiger looks and handles better than "original." Is it worth less because of it?
I don't know and really don't care. It's insured for 75k agreed value so someone else besides me figures it's worth a few bux.
Mr. King and others have clearly said what kind of car the Tiger is to most owners and I heartily concur.
If I were to do it all over again, what I 'd do differently: I'd likely go with a wide-ratio gearbox if not a 5-speed, and an even much rowdier engine.

And possibly midnight blue paint with butterscotch leather interior. Possibly.