William,
Nobody cares if you have original shocks & springs or not. Going to aluminium bodied adjustable modern replacements will improve the car dynamically and save 36lbs in weight (half of that unsprung).
If you do decide to install your hood vents, make sure you fold all 4 edges of the holes and then weld the folded edged together in the corners to stop it flexing. If you dont weld the corner a crack may appear sooner or later. I wish I had welded mine...I will next time.
Johnny
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