As standard, the best it would have had is a 10,000V coil and 6mm leads. The old favourite bosch blue coil was a popular upgrade at 20,000V.
I run standard recommended bosch plugs, slightly bigger gapped than standard, pertronix leads in black, 40,000V pertronix flamethrower coil black, original polished standard bosch vac advance dizzy (pertronix ignitor hall effect electronic ignition inside), with black bosch cap, on my AD 1600 in my crosser. Looked fairly stock until I added the baby webbers.
These are all good quality, reliable, proven products.
Some of the the popular suppliers have quality bundle deals as well as cheap ones, so worth having a search through. For the most part, you get what you pay for. Forget about anything cheap, or "dress up" see through, coloured or luminous rubbish, it will break or fail, probably sooner than later and cause a problem when you are on the road as well as looking tacky.
Let us know what you go for.