Sweet find! never heard of these so I pulled out my books.
Galen Govier book, looks like they made 11,555 of the Road Runners.
386 Road Runner GTX 440-4 were made and shipped to the USA. I don't have a number of CDN cars.
As for the 2014 price guide, 1974 Plymouth Road Runner 2dr CPE in #1 condition is $14,600.00. Add 25% for a GTX. she'll be worth $18,500.00 if you can get it there.
Not sure which code denotes CDN car, but I'm sure it is which would make it even rarer. hopefully you find the broadcast sheet!!!
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interesting numbers , but with the research that ive found only 79 roadrunners were gtx according to the dodge & plymouth muscle car by Peter c.Sessler ( the red book ) in 1974 , and 119 were made in 1973 , kind of funny that Galen Govier as other numbers ... and thats not even covering the C , canadian production numbers