Just my personal thing ..... but if I'm replacing a wire on an old car I always go thicker .... less voltage drop, mechanically more robust.... and old wiring was often marginal (and the source of many 'old car woes')
Unless you're obsessive about originality or a top end racer trying to save every gramme it just makes sense to me 🙂
In your boots I'd jury rig a decent bit of wire from the distributor to the coil ...confirm a decent spark .... and once you got it running, go back and do a permanent job at your leisure.
K
