[Grady Clay]

I agree with Pelican Rodsrer, do some diagnosis first.

Have the valves been adjusted?
If so, have you tried ‘just tight’ on the 0.004” gauge?

What oil are you using?
How hot is the engine on a “good hot day”?

The catalytic converter will burn excess oil – to a point.
Does it smoke at all when started cold?
What is the oil consumption?
What do the sparkplugs look like?

I would do both a cranking compression test and a cylinder leak test.
This will give you a better idea of what is inside.
Please report back.

Best,
Grady