No Problemo. You can easily convert your vintage campy hub to 130mm, and even use genuine parts, either by purchasing an entire axle set, or a universal 160mm+ axle and cutting it to the right size:
http://www.loosescrews.com/
Or you can source the 26tpi parts from Wheels Manufacturing (Axle only) through your LBS :
http://wheelsmfg.com/
The great thing about a 126 mm or 130 mm axle is that you can still run an ultra-6 or 7-speed freewheel on either one, just crank down on the limit screw so the derailleur doesn't drop the chain onto the axle. In fact, I am running a 5-speed regina freewheel on my 126mm beater Raleigh Pro right now.
- Don Gillies
San Diego, CA, USA