instead of using
ftp://ftp.gnu.org/gnu/gcc/gcc-3.3/gcc-core-3.3.tar.bz2 (or tar.gz, whatever you choose) you can try on your browser
http://ftp.gnu.org/gnu/gcc/gcc-3.3/gcc-core-3.3.tar.bz2 (or gz)
by the way, there isn't any folder for gcc 3.3.3, it jumps from 3.3.2 to 3.3.4, my example can be modified to suit whatever version you want (e.g.: 3.4.2)
hope this helps
Julio