u need to buy a carb rebuild kit and most likely have some on do it for u.......as for gaskets there are a few......but why are u changing them??? most likely needs a rebuild not just gaskets thrown in......wasting money and tearing up ur truck isn't a good idea......
search u-tube and google for how to rebuild a carb and then see if u think u can do it........but remember whatever the garage is going to charge u at this point will b double that if u tear it up first and a lot more if u break anything......