Byron,
Pre 66 blocks had nothing but pcv valves in them. 66- 427s had no emission equipment at all and pretty good stock cast iron exhaust header type manifolds. I am using the stock ones on my 69 big block, and other than weight, I only gained about 14 horsepower when I tried a set of headers. With the headers I could change plugs in 13 hours. With the stock type cast iron headers I can do it in 5 hours. So I am slow. And yes, if you have a 75 engine it will require all the smog equipment that came on the engine. And a lot of the earlier stuff will depend on the BAR referee that you have. Ours can be a jerk at times. Example, one person had to go get a painted air filter because he had his chromed. They were the same factory filters, but just never came chromed from the factory.
Jdog,
When you get ready and do yours, would you mind sending me an e-mail of all the steps you had to go through? We have a few up here that are thinking about that as they can't get one of those golden 500 numbers. I did talk to a couple of the peole at our DMV and get a few answers, but they seemed unsure of themselves.
Thanks,
Ron
