Ford Escort MK1 1974

[BigGreenF100]

Hi, I am looking at buying a ford escort as in title. For $1800.

I have a few questions.

* The engine is apparently a 1300 cross flow.
Can you do much with these engines.
Or is it better to swap to a modern engine / gearbox.
If so out of which vehicle(s).

* Its is a four door. Can it be converted to a two door.
If so, how difficult. (Not saying I would, but thought I would ask).

Thanks,