Can not kill LA......Running on

This is sending me mad. When hot & driven for some miles I go to shut it down & it runs on wheeze then blows smoke out the air cleaner.

The 318 has done 70,000 miles for new since 73, has no blow by, no oil usage, has no knocks & sounds good.
Its not hard to start hot or cold, have replaced the spark plugs with colder ones, set timing at 7%, has new leads, cap & rotor.
Have also rebuilt the carter carb.

It is fitted with Dodge electronic ignition.

What else can I try as its embarrassing & pepole keep asking if I need a firer extinguish.