Break-in Period for Rebuilt Engine

[DieselScout]

Rebuilt an old D24 NA I had kicking around and installed it this week.
Currently at 400 miles of running time since install.

What is the recommended break-in period for these engines?

I am planning to change the oil at 500 miles, 1000 miles and again at 2000 miles.
How long should I change oil at these shorter intervals? (Using regular oil as opposed to synthetic for break-in)

What is a normal oil burn for a freshly rebuilt engine, and when will it start to level off?
It has burnt 1 quart over the past 400 miles.

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