273 Exhaust

Hi, everyone. Does anybody know what I can use, and where can I get it, for my exhaust pipe? I have dual exhaust in the car now, but I just recently put in a re-built 1965 273 in my 64 GT. The dual exhaust is cut off right below the middle of the seats, and I would like to use it again. Being as frugal as I am, I'm trying to save myself a little money to use on the interior of the car. How hard is it to find the pipes that come from the stock manifolds?