Looks like a good Parker.  Yes, I would have it "fixed".  From these pictures I don't see anything that would cost all that much to make it right; around $300 maybe.  Blue the barrels and trigger guard would fix most of what I can see.  I would probably leave the rest alone.  But that is all from the pictures, you would know better with gun in hand. 
 
Removal of the pin is not a good idea!! 
 
What happens when you take the forend off?  Since it was shot I assume the action feels free when you load it?  Have you oiled it with a good light gun oil? 
 
How are the bores, are the pitted or mirror?
		 
		
		
		
		
		
		
		
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