It is the same one I've been looking for. I just ordered one from RockAuto made by Dorman 55125.
If your fuel line is 5/16 the female thread is 1/2" - 20 and the Edelbrock inlet is 5/8" - 20.
Another poster suggested FU-440 from Jim's near the bottom of the page here: http://www.jimsautoparts.com/fuelpart.htm
Try here it's just $19 with shipping: http://quadrajetparts.com/carter-carburetor-parts-carteredelbrock-afb-avs-parts-afb-avs-inlet-fittings-c-299_130_133.html
Notice there are two; one extended thread and one oem. The tread on my Edelbrock 1407 inlet is 5/8" - 20 and only about as long as that oem one.
Do you still need the fitting?