These are parts that I bought for my 1989 Pontiac Firebird Formula. I recently sold the car, but the buyer didn't want to spend the extra money for these. The current price for the heads is $1200, but I bought them when they were $900. They are centerbolt heads. You can also see the current/bought prices for the fuel pressure regulator. The runners and header prices are what I bought them at, I don't think they are being made anymore. The headers are for cars with dual cats or fabricate new head pipes. I did notice that most of the big tube runners had went up to about $450 before they stopped making them. I don't think Edelbrock makes those exhaust parts anymore, they seem to be more into carburetors now. I would sell everything for $1600.