Yes, very much so. The forks too.
Caveate: depends on the amount of damage, Some frame builder would prefer to replace the top and down tube which runs into real money with decals and a repaint.
The head tube geometry changes on a frame that's run into something plus the fork rake and steerer can be off. An average inexperienced rider may not feel any difference but because you discovered the slight damage, it may constantly nag you.
A well aligned frame is a joy to ride!
Giordana frames were built for Gita Sporting Goods Ltd. the US importer/distributor for Giordana cycling apparel.
Pegoretti helped design the Giordana house brand frames for Gita.
"[At one time] Gita was the sole importer for Pinarello, Merckx, DeRosa, and Pegoretti.... Giordana frames sold for $1190 when you could buy a Merckx Sl or DeRosa for $895.00."
I have a Giordana Capella frame made with Oria tubing. The person I bought it from used to sell Giordana frames back in the late 80's and early 90's. He told me that it was made by Pegoretti. I was told by someone else that the less expensive Giordana frames were made by Billato, a major Italian contract builder for better quality frames.
The better quality Giordana frames (i.e. maybe yours) with Columbus SLX tubing were most likely made by Pegoretti.
So yes whether it's a Bilatto or Pegoretti it's well worth having it straightened and realigned. A good frame builder should be able to get most of the kinks out and restore the original frame geometry.
You may get some minor paint chipping at the kink but that cane be easily touched up.
verktyg
Chas.