Re: someone sell me a engine that runs or gimme shelter
Fuel seems most likely. Just cause it's getting fuel to the CARB does not mean it's getting to the ENGINE.
I'd check for clogs or defects in the jets and passages.
Possibly timing? Is the key in the mag rotor still good?
Spark in the wrong place will not work yet pass the easy checks.
If none of those pan out, hit it with a big hammer till it runs.
If more is better, then too much is just enough.
If you can't afford it, build it yourself.