The others are right.  When you come to sell the car, who would want to buy a 200 / 200 Cup "cross breed"?  Also there is a significant risk that adding bits/ parts and messing around with the car would reduce the car's reliability / increase the number of problems you could have with it.  My advice would be not to accept the car.  Don't second guess yourself, you obviously wanted a cup chassis and now doubts are creeping in - refuse it, and get what you wanted.
				
			 
				
		 
			 
 
		 
 
		 
 
		 
 
		