I also have a Louisville '76, tranplanted from sea level. Mine runs a header straight to a muffler, no other smog equipment at all. Test is pretty easy, I took it to the emissions place in Boulder up by the airport and failed the first time. Took the test results over to Charley's in north Boulder http://www.charleysgarage.com/aboutCG.asp
and $36 worth of carb adjustment later I passed no problem. Then you just plunk down the cash for the 5 year collector plate, and you're done.