'68 318 to carbed Magnum 5.2: Check my checklist

I know they exist, had one on the carter competion series on the old 318 that was originally in my duster, just not sure of what thread the carb is.
But I do remember buying the fitting from summit.
Maybe give them a call?

The Edelbrock's air horn's fuel inlet threads are supposed to be 5/8" - 20tpi, and the fuel line is 5/16 inverted flare.

This looks like just the ticket. Ordered one not a minute ago:
http://www.ebay.com/itm/Rochester-C...ash=item27d12218f1:g:syAAAOxyyF5RTN7O&vxp=mtr

-Kurt