I take it your Guerciotti is a steel frame, probably SLX or Columbus something and rides very smooth and tight.
In my opinion, you may see even less of a benefit/difference except in brifter shifting from a newer bike in the sub 1k range. A trek 1000 or similar would be a logical choice in upgrading (with stated funds) and personally I'd rather ride a steel beauty of top notch quality like you have.

Campy record of yesteryear is still top notch stuff.....I have a 1991 Basso Lotto with campy record, same saddle as you, campy delta brks, yipsilon wheels with the best verdestein tires.....what a ride.

Just my two cents