Need Help Hooking Up This distributor

I’m installing the same distributor on a previous points system. I read that my existing coil may be too small and am looking at upgrading but can’t find any info as to what size coil. I’d prefer to go with the round can type unless that’s a stupid idea.?

Currently everything is hooked up to the existing coil and it won’t fire. I’ve put a timing light on and while cranking it’s not getting any spark? Would that be the small coil issue?