If you are noticing fuel drip from the venturi nozzles happening at idle, I would suspect there is crap clogging that circuit. Neither venturi nozzle should be dripping at idle, and both should mist when you give it throttle. If not, then you have a problem.
But in any case, if you think it's something internal to the carb, a simple teardown/cleaning/rebuild would suffice long enough to pass smog (provided that it didn't pass before because the carb was dirty). Rebuilt kits are inexpensive and you don't need any special tools to rebuild the carb. The drilling out of the idle pickup tubes is just the long term solution to the problem of the tubes getting clogged easily.
If you already haven't seen this site, here's a link to the best resource online that explains the OEM 4.2L setup: Adventures Under the Hood
If you are running stock with a functional computer, you'll need to make sure everything is working as it should, otherwise you'll probably not pass.