Ok - you don't mention what model - I am assuming a V6 being a 2001.
If it has been worked on for a year and cost $4500 - is it fixed.  Why would it not pass a roadworthy??  Pressure problem? Is it not fixed - I am a little confused on the actual state of the engine now.  If it is not fixed why have you spent $4500.
If it is fixed then the engine problems that existed before should not cause you any problem - likewise if it has been repaired I do not believe you are ethically obliged to release the information - however, the engine would have had to be reconditioned or near enough to it - so is a selling point.
So - if the engine is fixed - sell for red book price.  If not - you will only get about $500 - $1000 for it at somewhere like a wreckers - similar on ebay etc but you might get lucky.
				
			 
			
		 
			
				
			
			
				REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101 
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
			
			
		 
	
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