Replacing 2bbl for 4bbl Challenger 318. What to I need?

Hi all. I bought this 1973 Challenger 318 and it has a 4bbl (originally 2bbl).
At some point in the past whoever has installed the 4bbl decided to create and adapt things in order to keep it running. Maybe due to the difficult access to parts? No idea. Anyway, it works but here's how everything started with me:
The acc pedal was very hard. I checked everything, springs, etc, all good. So since no one has touched the engine for a long time, I blamed the cable. Ordered a replacement and was...

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Author: DToro