The auto choke is a pain and I should have replaced with a manual choke long ago when the kits were easily available.
I stopped using the lead replacement additive after finding out the valve seats were hardened ones and just use ULP now.

After adding hotter plugs the carbon fouling eased sufficiently for me not to have to clean the plugs every few weeks.
They are still completely covered in black sooty deposits but still fire enough to start the car every morning.

I changed the timing up and down to see if there was some improvement in fuel economy.
The "sweet spot" is 7 degress BTDC as per manufactures spec.
Fuel consumption is still about 15 L /100K on very short drives 5 km to 10 km trips (a bit better on longer trips).

And I still like driving this now rusty bucket that has no sheen left.

Pity so few people are now interested in this old car. Over 25 years makes it a vintage car?