70 challenger, fender tag decode

Well of all the random things to have fall in your lap, a 70 Challenger just fell into mine.
I am away from the shop for the 4th but pops stayed behind to hold down the fort.

I get a text early today saying "Trade the model T for a plum crazy 70 challenger?"

And I reply, **** yeah.

Next i get a call from pops saying its a done deal...

So anyone care to decode this fender tag for me and tell me what we just bought.

Here is what i think it says.

EN1
FC7 C16 C555M21R11 YAS
FC7 H6X9 000 306 115542
E44 031 3423 G08 271543

THANK YOU!
Hell yea congratulations! I just scored 2 ebodys myself! From what I can decode its a plum crazy 318 hardtop car.