The paint looks nice but the decals are kind of plain, especially the head badge. I would guesstimate $500 since it is a respray but you should ask Marinoni if they would fill in the pantograph on the seat stay cap, I am surprised they didn't do it in the first place.
Impossible to tell the model without pics before it was painted.
As for a group, C-Record if you plan to keep it period specific.