i bought a complete set up minus the air cleaner about a year ago for around 3K and i thought that to be a very fair deal-- it was an OG manifold and included all the linkage.
intakes are usually in the 500ish range and on up for #'s units and then you have the carbs, figure another 1K plus (obvs. more if the #'s be what they need to be) then linkage and an air cleaner.