personally , I've never seen a Dia-Compe on Huffy, but ???
I know others used them, notable some Columbias,Vista.
I know later 70s Huffy used the steel calieprs ( either Arai or the 'fish' logo ones, not certain which without going to check ).
If it's a rider, nothign wrong with the DiaCompe ones, or.. ones I like are the repop 'Action' brand ( got mine on amazone), near copies of the Weinmann or Diacompe style, but no brand name at all, nice smooth look).
here:
http://www.amazon.com/BRAKE-ACTION-...UTF8&qid=1425697565&sr=8-4&keywords=890+brake
That's an 890 mm reach, as Schwinn Fronts,I have the 1080 as well, might be a 1020 reach as well... unsure what Huffy used,Raceur (shorter ) and Grand Prix (longer), maybe 890 and 1020 respectively ?
For a resto I'm anal enough to worry about the Excel branding, but for a rider / custom build....
your mileage may vary