Depends on how you plan on getting you donor parts, and what kind of registration you want. 
 
If buying a single donor vehicle, and the engine is good use that engine. Sierra haynes manual covers all the engine options. 
 
If wanting a new reg you would have to buy all new parts. Engine could be reconditioned as new. In which case I would have thought you would go for a zetec. By doing this you would need a cat and fuel injection. 
 
Hope that helps 
 
Mark 
		
	
		
		
		
		
		
	
		
		
	
	
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