Well,.. if the petcock and carb have been thoroughly tested,.. you must be getting gas...
So,.. check for air... filter,.. filter boot, intake manifold... is something restricting, or leaking air?...
Believe OF,.. there are no shortcuts to testing parts... a complete test, eliminates one possibility, but it must be a complete test and elimination...
Petcock test,.. good
vac line,.. good,..
carb,... good... ( a lot of possible's there)...
Getting fuel,..
Air filter,... filter boot,.. intake manifold,...
Getting air...
Hope you found it...
Because what's left, sucks... spark and compression...
If you get past fuel and air,... (be sure....)
We'll guide further... just pop back with results...
There are also several safety cut-outs... .. but they don't usually mimic, fuel shortage...
Don't give up... keep testing, be thorough,.. post results,.. and we'll follow and help...
...