Even though this thread is almost 4 y/o, it's worth mentioning that Cliff will sell you everything needed
to do the same mods he does. Armed w/prior experience, his book
, and/or tutorials like this
, doing a performance rebuild on a Q-jet is within the reach of almost everyone.
BTW, in addition to his book, he has an active forum
of his own- and he answers questions there as well as on the phone. He'll go into as much detail as you can absorb; he doesn't hold back any info.
Another useful book is Rochester Carburetors
by Doug Roe: