I recently purchased a 78 Spider that did not pass smog (California). It looks like the previous owner tried getting it tuned but it still failed. The results were:
My car @15mph: 8.8% CO_2, 5.3% O_2, 246 HC, 4.72% CO, 427 NO.
Max to pass @15mph: 222 HC, 1.41 CO, 1396 NO.
My car @25mph...