Im doing some engine bay clean up on my 1970. I noticed these two lines running out of the back. I have absolutely no idea what they go to.
I am guessing here the small one goes to the heater valve and the larger one goes to the vacume can on the fender.
No, those originally went from two steel tubes along the drivers side valve cover to the distributor modulator box under the dash. It was an emissions control system that you don’t need.