66' Barracuda and 273 with headers

Sweeeeet 66 ddarts ! any specs/details on the 273 build ...we All would sure appreciate ? I'm looking to build a stout 273 as well as others do too.
I have no idea what was done with the engine. I was able to find and install the original carb, carb spacer, choke cable and air cleaner assembly. All are one off parts. I believe it has a higher lift cam than what came in the car. The tortion bar cross car bracket was hacked up to get the unknown brand headers it. I would not go that route.