By the numbers restore or take some liberties?

What's your take on a non HEMI or Big block numbers matching 69 340 Dart GTS?
Setting aside the do what you want it's yours philosophy, should these cars be kept original? My understanding is that this model ran low production numbers.

As some know, I am putting one together and have made some reversible mods to it. I'm also not nut and bolt crazy meaning I have Non original ARP fasteners sprinkled about. But for the most part this car is 90 percent.