Welcome to the board Garrett! Unless they made a mistake at the factory, your car should have had the gator grain vinyl on it. I haven't seen the houndstooth on any e-body that I know of. I pulled out my "Challenger and Barracuda Restoration Guide" book and it says that in 1970, the only color choices were black, white, green or Gator Grain.
If you want to get back to Gator Grain, good luck! I've been looking for over 3 years with no luck. I think we're going to settle for a vinyl that's not 100% accurate but pretty close.
Good luck. We'd love to see pics if you have some. Never saw an e-body with houndstooth before...that would be interesting!
Welcome aboard!