All Classified forums require a Site Supporter subscription. It is only $25 per year and you can buy and sell whatever you like on the forum. To become a Site Supporter, go to Your Profile and select "Paid Subscriptions."
I had the exhaust done on my 79 for $400, with me suplying the cats. The same shop quoted me $300 for the 74 with my own flowmasters, and the 79 was a shorty... weird.