If you go back to the first page of this post, I answered your question.
This one stands out though;
1 the door sticker says 3-70 fender tag 401, block no vin 4-3-70
2 door 3-70 403, " "
3 door 3-70 407 " "
It would be impossible for any car built in March 1970 (assuming the door stickers you are looking at are originals) to have an original April 1970 cast engine from the factory.
Yes, impossible for a March built car to have an April casting from the factory. Second car, still impossible.
You can rephrase the question any way you like, but nothing will make the scenario you are evidently hoping for possible.
