You may get a different attitude here than other vintage groups, since there is an undercurrent here of "Whatever it takes to make it ridable for you." That is, unless it is a really rare bike that belongs in pristine condition as a museum piece.

If you would like to try a carbon ork, then you should. I used to have a 1989 Cannondale touring bike with a steel form that rode very well for the little time I had it on the road. And that was with a tweaked rear triangle.