1.3 k11 is very slow help?

Hi guys im new here and long story short im puting a nissan micra engine in a classic mini.

But basicaly iv been given a 1998 micra 1.3 its been sat on a farm for a year and used to pick up hay from the barn once a week so not been driven properly for a long time. i drove it home and it was so slow it wouldnt go above 60mph in 5th gear. there is oil and water in it and there is no cream in the oil so headgasket should be ok. It revs fine to.Is there any comen faults it could be where do i start
 
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