A few months ago I bought a set of Magnecor ignition leads from ebay , constructed for the Morgan Three Wheeler :
https://www.ebay.co.uk/itm/Magnecor-KV85-Ignition-HT-Leads-Wires-Cable-Morgan-3-Wheeler-2-0-V-Twin/401811123569?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
This was on the back of a thread discussing these.

Reason for the post - they do seem to make a positive difference, especially to starting.
Instead of the usual "Kachunk-Kachunk-Broooom" as it starts , on first fitting I got a 'KaBroom" - VERY satisfying !
Nothing else had changed.
So satisfied customer and a reccomended upgrade.

Also worth mentioning I fitted these double loop cable ties :
https://www.ebay.co.uk/itm/Double-Loop-Cable-Ties-Loop-Tie-Wrap-200mm-300mm-Black-Choose-Size-Quantity/111960039028?ssPageName=STRK%3AMEBIDX%3AIT&var=410903154126&_trksid=p2057872.m2749.l2648
to replicate the factory ones I had to cut off.