Marcos Maniacs

For all you knowledgeable maniacs,

I am trying to find out the normal differential ratio for the Ford 
Essex 3L and what ratio do you think that I have if at 70 mph the 
revs are approx 4200

Also I have heard that you can buy a new 3L Essex engine [fuel 
injection]which is made in South Africa. Does anybody know details??

Regards

Vic