EFI return line, use emissions return?

The one I got looks like this one:
http://www.ebay.com/itm/63-76-Mopar...t=Vintage_Car_Truck_Parts_Accessories&vxp=mtr

If the link doesn't work, seach "Dart fuel A-body".

I recall paying ~$45, but probably shipping so above might be same price as above. I bought another one recently to try on my 65 Newport since I have a home-made sender adapter for return there (Holley Pro-jection). If it doesn't work on a C-body, I can use on the Valiant I got since. I recall the vendor was A1Autoparts or such.

If I ever remove it, I will try enlarging the swaged part of the 1/4" return tube, since that is a noticeable reduction and probably the main culprit in the 9 psi return pressure I measure in the engine bay.