I have read this entire thread in one sitting and once again am thinking of restoring my 1978 280Z. I am the original owner. I have lived in San Diego since 1979. One thing that really bothers me is the smog testing every two years. The car passes but California toughens up the emissions every time I take it in. Reading your posts has me thinking about a lot of issues my old car may have: cracked vacuum lines, clogged injectors, faulty AFM, poor fuel pressure, etc. The car barely cranks in cold or rainy weather and when it does it acts likes there is no fuel getting to it and back fires (sounds like someone hitting the engine with a hammer?) if you touch the gas. Once it warms up, it's like its old self. I put 244,000 miles on the original engine and a Japanese rebuilt long block now has 65,000 miles on it. Anyhow, have you registered your Z with its modified cams, headers, etc in California yet? Did you run into any issues? Shoot me a PM if you want to get together sometime and talk Z's, motorcycles and have some craft brews.