What's the cheapest way to install and exhaust system on a big block a body

No such thing as cheap headers anymore. We did big block B-body headers in a 71 Demon and had to cut several tubes on the drivers side and remake them. Only way to do a cheap header set-up is to buy them used and get out the torches and hammers...
All that's needed with the 78030 header swap is a torch and ball peen hammer. move the steering column neck back and manual steering.
I wouldn't think twice about using them again.