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1,Your distributor cap is not stock.
Are you going to use an "HEI ignition"? Which one?
2, Are you saying the a 70 crank engine would be different than a 69?
I just had a 69 rebuilt for my 69 Road Runner. But the engine did not come with the car.
I think it was drilled but not reamed. It may have come out of an automatic car.
So I'm trusting the re- builder prepared the hole correctly.
They did install the standard pilot bushing I gave them with the engine.
3. This is how I prepared an automatic 440 to go into a four speed car.
I only needed to enlarge and deepen the hole for the fourspeed.
I did not have to be precise since I used a register bearing for that car.
I used the existing hole as a guide for welding an appropriate drill bit sized jig.