You could try Dean Tilleman. He runs 'Dean's Dodges' near Okotoks. His number is 403-938-4172. If he doesn't have what you need he'll probably give you a few other contacts. Good luck with your Cuda
If you're looking for used parts, Heavy Metal in Trochu is another place to check. Or if you want new, Classic Performance in Calgary sells restoration parts and is a distributor for Year One and many other well known companies.
I might have at least some frame rails.
Maybe some floor pans, p.m. me for some more details.
Do you need full frames or patches? I have both.
I will sell all for pretty cheap.
Tom.