I have noticed that it is not uncommon for the stays to already have been cold set, or bent slightly or tweaked a bit out of square, not to mention drop spacing.

Vintage road bikes are a bit fragile, in my opinion, and it is easy to distort the rear stays, or drops, particularly pressed steel drops. With this in mind, many bikes need to be cold set back to original specifications.

Spread to 130 is a personal choice. I recently resisted the urge to destroy original with hopes of running a newly acquired Campagnolo Veloce 9 speed grouppo. The grouppo, wheels and all are still in storage. I just could not alter the frame set away from original. But that is just me.