I'd say you're probably correct about it not being an R/T. A/C dashpad, non-a/c controls shows the dash pad may have been changed. The bezel under the speedo is for a non-rallye dash as well. Doesn't look like an original 4-speed tunnel but if it is, did they even make 4-speeds with A/C? Would be very interesting if you could find the rad support numbers...just my $.02.