I have been out of Town for a couple of days. Thanks for all the information. I did not intend to create a debate.
What Mark has said makes a lot of sense to me. I originally thought this may have been some type of glitch at the factory. Reading through the assembly process and knowing the subframe and engine come late in the process it would really be impossible to get this mixed up. It would have forced a manual change and there would have not been factory parts available to connect a quadrajet with a single line. So I have my answer to the original question. I will continue to look for evidence the fuel line was changed next time I get the car up so I can look very closely.
There is seems to be a question about my car and I would like to find an answer.
I still believe I have a big block RS/SS car but I am not certain the right engine combination. Here is a link to photos of the engine stamped codes. I have not changed them. I have known the car since 1979 and owned the car since 1980. If the engine was changed, it was prior to that time. http://www.kodakgallery.com/BrowsePhotos.jsp?UAUTOLOGIN_ID=44858550610&collid=44858550610.297065621110.1174259933433&page=1&sort_order=0&navfolderid=0&folderid=0&ownerid=0
Do these appear to be correct or restamped?
I think it is a big block car for a variety of reasons. Not only do the stamped dates match for the car, the cast date codes put it in the right time frame. Everything else about the car appears to be correct. It has a big block heater core, tach, gauges console, disc power brakes, multileaf and 12 bolt. The rear end was very dirty at the stamp and if some restamped that it was a long time ago. The date code is right on the rear end. The car also had the hockey stripe and black rocker panels hidden under the repainted surface which I found in the 1980s. This fuel line is the only thing that raised a question for me. I don't ever plan to sell the car so I am not trying to create a clone, I just want to determine the original origin of everything.
I need to check for the exhaust frame bracket sometime soon.
I don't know what else from the cowl tag would help as it has no X codes. But here is the rest awatway. 12A,ST69, 12437NOR193935BDY,TR715,53 53 PT. The VIN is 124379N553662.
I appreciate the feedback on things like brake brackets that I was not aware of to narrow down the possibilities.