Numb heads are typically caused by a combination of excessive reach and stack (height). If your current vintage handlebars are probably 25.4 dia with 100mm (they might even be 110 or 120) reach you can try these modern-style compact bars by Uno that measure 25.4* x 70mm. They'll decrease your reach at least by 3cm. Then you might lower your quill stem all the way and try that position with these compact bars.
https://www.ebay.com/itm/UNO-alu-Roa...-EK_R5hFzoB6Rw
The vintage brake hoods are also pretty narrow and uncomfortable too, as Carbonfiberboy indicates. Compact bars and new brake levers to modernize your cockpit might be good idea. Think shorter reach and lower bars. Vintage bikes have enormously tall head tubes which easily creates excessive stack. On my vintage bike I ended up getting a quill stem 1-1/8" adapter with a -25 degree stem in combination with 31.8 dia compact style bars. You could also accomplish the same thing with a Nitto Jaguar (track) stem using the 25.4 Uno bars.
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1311.R2.TR2.TRC0.A0.H0.Xnitto+jag.TRS0&_nkw=nitto+jaguar+ste m&_sacat=0
Here's a good stem calculator you can use to contemplate different stem and handlebar combinations
http://www.yojimg.net/bike/web_tools/stem.php
What is your height? 59cm vintage frames would fit someone 6ft / 183cm-ish.
EDIT: *It's come to my attention these bars are 26mm diameter, not 25.4 as erroneously described by the ebay seller.