some of the problem dosent sound like just the carb out of tune some of your problems sound like a timing issue. get a timing light and make sure the motor is in time because there is no sense in tuning a carb on a motor that isnt timed. on the side of the fuel bowls there are screws on the side adjust the fuel level until it is level with that hole im pretty sure you adjust it from the top (not completely sure havent done it in like a year) im only learning about carbs so i hope someone can explain what im saying better i dont know all of the names of the bolts and screws adjusting the idle should be easy its right by the throttle also i would buy a rebuild kit. i have a fresh rebuild 4160 that i will sell for like $35-40 i have never had it on a car since the rebuild so its not tuned at all if you are interested you can email me at
tyler.brown@lakeviewacademy.com
like i said im not a carb expert but my dad is pretty good with them if you could get a owners manual for the 4160 im pretty sure it tells you everything you need to know to tune it