Greg,
Great question.... I took these pics from my 39xxx mile 1969 6 cylinder 300 Deluxe Post Sedan Chevelle. The lines are laying back behind my garage.
It`s oviously not an L78..... however still is a 3/8`s original fuel line.
The first two pics of the brake line clips, Yellow.
The second two pics are of the fuel line clips, hard to tell from the picture, they are a lighter Blue.
Brake lines clips...
Fuel line clips...
Dan.