I'm looking at getting headers for my 78 Formula. I have the Olds 403 and the car is pretty much original. Currently I have a flowmaster cat back system and a magnaflow cat. I'm planning on putting in an edelbrock performer intake manifold and I have a holley air cleaner that I will be installing later today. The biggest issue I'm having with the headers is finding a pair that is smog legal in CA, because I still have to get it checked every 2 years. I was looking at hooker headers, but couldn't find any emissions legal ones. I appreciate the help.