Take the head off the engine then you will see the top of the valves. Look on the side of the motor right below the valves you will see a cover with two screws remove them and you will see behind it the stems of the valves - there are two springs you have to push one at a time and there is a slide clip which slides and pops off. Then push the valves up and pull it out of the engine.
Valves are sticking open . Sometimes you can remove the head and use a wire brush on valves and then use some penetrating oil and work the valves to free them up .
.030
1ml
SAE 30
30wt oil of any brand will work
Run the car good
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.035 spark .020 points
All the small Briggs engines seem to have a points gap of 0.02 inches
any where from 120 lbs to 180 lbs
A Champion CJ8Y or J19LM will perform fine
The spark plug should be gaped at .030"(76mm)