IMG_5486 shows the partial VIN: 0B150353 or 0B160353. If the VIN on the car is JH23H0B150353 or JH23H0B160353, the transmission is original to the car.
One other '70 Challenger dash difference. The plastic under dash pieces have different shaped edges where they meet the dash. The '70 dash will follow this edge pattern. '71 - '74 have a different pattern.
This may be the case for '70 and earlier B-body k-frames. I know my '70 Challenger had a k-frame that should not have been on the car. I tried to add a sway bar and the k-frame required the bar to pass in front of the k cross member, not through the cross member. I swapped the k-frame for an...
B body k-frame will have a 2 degree angle difference in the steering gear to steering column alignment. It will also not support an e-body sway bar. Other than those items, it can be used on an e-body.
I've seen 440 oil pans with the following numbers: 187, 402, 699, and 971. Not sure of their applications except the two 187s I have were from '71 Imperials.
Worked for me. 440 with its original mounts dropped right on the 318 K-frame with no modifications. I went with the e-body 440 torsion bars and added a sway bar.