i've found the quickest way to adjust carbs nowadays (in the shop at least) is to hook the car up to the 5 gas analyzer.... i get HC and CO levels just to about what spec says for smog laws and keep the idle to about what the book says depending of course whether its been cammed or what not... works like a charm.... can ussually get 'er tuned in about 5 minutes, test drive to be sure and be done..... if you dont have a smog machine though... kinda makes it difficult