Welcome!
As said above, there are mods that provide significant improvement and are not even visible, i.e porting, polishing.
There are others that are quite easily reversible, such as exhaust, that just make the car so much more fun.
Nothing wrong with bone stock, except that an LT-1 of the same vintage sounds deeper and better.
While many don't believe that any C-4 is special, those of us who have driven a ZR-1 know the real truth.
Enjoy
your piece of Corvette history!
Marty