New member with 68 Dart and fuel problem

How rusty is the sending unit. They all get a redish residue on them over time. I'd try cleaning in, blowing out the passage and putting a new sock on it. Then blow out the body hard line. And new rubber hoses.

That sorta looks like Rhinodarts (from Chicago area) old 68 Dart GT. IIRC, he put a reman 360 short block with 330 hp cam. Been for sale at various classic dealers for a few years it seems.