Temporary exhaust system
I used the Jegs version @ 2-1/2 and regular comp. headers from Hooker.
It's in my resto thread.
Then theres the $100 (or so) summitt headers, muffler of choice, like the Thrush's under $30 each and some pipe, 2 hangers and 6 clamps. You could be done for about $170, give or take.
Used swap meet or here in the for sale ad's could net you cheaper headers and/or mufflers.