Ron, it sounds like you have a very unique and desireable car, one that I have always thought of trying to get some day.
I can't comment on the Q vs R code torino's, as there may be a difference in the engines, but I can tell you, with mustangs and cougars, whether it was a Q code or a R code, the 428 cj motor was the same. One common misconception is that alot of people think that an R code mustang means a SCJ motor. That is not the case. If your cylinder heads have 4 bolt holes around each exhaust port, then you have 428 cj heads, which are designed from 427 low riser heads. They're the only heads that came that way, with 4 bolt holes around each exhaust port. The cam and top end of cj and scj motors were the same. The heart of the 428 scj motor was the use of the 427 lemans capscrew connecting rods. All other engine modifications were required because of this change. The 427 cap screw lemans rods used in the scj motors were heavier than the standard cj rods. This required a different dampner and flywheel to balance the motor correctly. Although the lemans rods were better than the standard 428 cj rods, they probably are inferior to what is available today.
Ron, I own a 1970 428 SCJ Mach I. One of 1000. They built a total of 3500 cj and scj mustangs in 1970. I also have a set of matching 1968 428 cj heads and intake from a GT500KR, dated 4/68. They have the 4 bolt holes around the exhaust ports.
here is a link from a 428 cj mustang web site comparing the 428 cj and scj motors.
http://www.428cobrajet.com/cj-vs-scj.html