I used a one wire o2 sensor I had laying about in my garage,a DVOM and the info I came up w/ doing a "google" on "o2 sensor carb tuning." Paid $20 to the muffler shop to weld a sensor bung in my pipe just behind the collector. I think it was tons better than reading plugs, maybe not as good as tuning at the track for time and probably not as good as on a dyno but since I ain't been to the track in months and don't have a dyno handy, it went w/ this method. A lot of folks had bad things to say about A/F gauges and I don't really want one in my car full-time, another reason to have a DVOM in my pass seat for a few days.
http://www.telusplanet.net/public/gilesij/Volvord/carb_jet.htm

probably helped the most

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'74 Red TypeLT. vortec headed, warmed over SBC 350, edel 1406 carb, summit special cam, dyno cerama headers, 2 chamber flowmasters w/ x-over pipe, TH350 (used to have a 700R4 or 3), 3.08 posi, electric fans, mallory 50 series dist, chrome TH350 dipstick, chrome power steering bracket spacer, hex-head header bolts (package said 5HP LOL), rotting carpet, new pwr steering pressure side hose, blah blah blah bla bla bla bla

I have been looking something like this for a while, just never looked hard enough. thank you