My first car was:
74 Duster 318, then:
72 Charger 400
73 Barracuda 318
71 Cuda 318, then 440, then 426
70 Challenger 340
2010 Challenger RT 5.7
74 Duster 360
Still have the last 4.
That is a great find!
You can check the motor and tranny for the VIN number, the options not so much unfortunately without the build sheet or fender tag.
Possibly down the road a bit. My son has a 70 challenger and has a line on a 69 426 that if it would work out, we would need them to “70ize” the engine.