Car wont Run!

I am thinking its the carb too. When i bought the motor the carb was on it. THe motor had been sitting for about a year in a wrecked truck. They started it up for me when i bought it but i have always been worried about the carb being bad. I also did not replace the fuel sending unit in my gas tank before i started running the engine in my car. My tank definitly had some crap in it since my car sat a few years. One thing i have noticed is that when i turn the adjustment screws on each side of the carb nothing happens. In the past wheni did that the motor would die.