I don't know the answer to your question, but I suspect that a new BB will work fine because - I have a 73 Campy pista BB and I'm pretty sure the spindle is symmetric, whereas the double at the time had an asymmetric spindle that was longer on the drive side. I also have a late 80's Athena BB for a double and the spindle is symmetric. So you need to find out if there is an issue with the tapers on a new BB and how long the spindle needs to be so that the crank does not interfere with the chain stay. I'm guessing that a new Miche pista BB will work fine because the cartridge position in the frame BB is adjustable. Others here are likely to know.