292 problems lean or advance?

[292farmer]

ok ive got a 292 with manual tranny (sm465), the motor will not run above 2000rpms for more then 8 secs, it just stops and if let foot off accelerator pedal fast enough sometimes it will catch itself and idle, or it just dies. it does this driving and in neutral. i've replaced all fuel lines, checked lines into tank, and tank itself replaced fuel pump, and gone through carb(PO used silicone to seal gaskets! its everywhere...). i looked at my dizzy and i cant get the vacumn advance to work. will that cause my problem, or is my carb running to lean due to silicone everywhere. i tested advance by sucking and blowing into line and nothing moved. or is it both? im trying to find another carb been looking two months cant find one i can afford. or works with my motor.