Ive bought a car that had that done that way and thought it was jinkie as hell and replaced it.

But id say yes.

But on my bracket car ive al. line with the... oh whats the term... its got the brass flare ring that tightens down and then an 6 male.

Compression fitting.

Long day... maybe a pic would be better.. brb.

I use a -8 compression fitting into my return line.

As nice as your red cuda is id bet you could find a compression fitting with a nipple and make it look nice and maybe a bit more "proper".