Looks like you've acquired a set of those cast iron headers used with the Hyperpack - I understand they are quire rare! Looking forward to seeing more of your wagon project.
When I was a kid, 15 years old, now I am 55, I bought a 62 Valiant from my next door mentor. It had a 61 Lancer front end and trunk lid. I rebuilt the engine and made a few mistakes. We fixed them and he wanted to know if I wanted to make the slant run a "little" better. $110 dollars later I had the intake and exhaust manifolds. The rear manifold had been modified to run in a 32 Stude at Langley VA. I think he was runner up in the state championship one year in the '60's. I have the stuff every since. I have had the intake in the 62 Valiant, a 66 Dart, a 64 Barracuda and the last was my 67 Barracuda. I have been collecting parts to make a run at the NHRA Stock Class. We will see.