Here are pictures of this frame, sorry no side on as it is at Bill's where he is building a lugged fork to replace the carbon fiber fork which was the rage around 2000. He will also strip the frame due to many many paint issues, so it will be repainted, new decals and his signature on this custom build from 2000.
And good as you could get tube set.
Long story short, return to original. This is a racing frame, made for 700c rims and at most, and it's really tight, 23mm tires, so make it as it was, but with modern 12 speed compact double and cable rim brakes.
Oh and yes the braze on, on the drive side chain stay, were intentional, for a stainless steel metal guard to ride over the chain stay protecting it from chain slap, no idea why, but that's what's great when you build your custom frame the owner got what he wants.