If the car had fender mounted RT badges than it would have the holes in the fenders, however if they got the longitudinal stripe than the would not be any holes since the "R/T" is part of the stripe.
The RT part doesn't mean it would have torque boxes, those were a result of the engine choice such as 440, 440 8 pack and Hemi. I do not know if they 340 and 383 cars got them or were supposed to get them. There are many reports of cars that should have had them that didn't, my 70 Challenger is a 440 car and it has them.
The K frame again has to do with the engine selection, here is a good thread about them
I.D. numbers K - Frame Member question
What is the VIN of the car? If it is JS than it should be an RT. All of this information is online many times over but "R/T" was a package or option code and with it came a number of things such as the stripes, performance engine selection, rallye instrument cluster, etc.
The chrome tips dual exhaust could not be had on a CA sold car so an RT sold there would not have or was not supposed to have them.
Are you trying to figure out if your car is an RT or are you trying to make a clone of an RT?