Hi Andy,
That is what I am more or less looking at on RockAuto (and other sites) for a 3-line Fuel pump for a 72 C10 350. I am pretty sure that lower can
is longer than what is installed on my C10 with a 3-line hookup.
On my 72 truck (the way I got it) it has a Short 3-line Fuel pump but all the short ones are 2-Lines (for a C10 72). Parts store list only a Long Fuel pump for 3-lines.
Sticking with Delphi, this is a part number of MF0055 on RockAuto.
Since clearly they make a Short 3-Line Fuel Pump and I found it on RockAuto for a
72 Nova but it is also called out for a 73 C10. This Delphi part number is MF0002.
I looked at my Chevy manuals and I only found one place about the Fuel Pump and it was only a few pages long and only showed the short two line version.