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The pump is the same. I don't know if you can still buy the puckup tube new but if you find one you need the special main bearing cap bolt to go with it, it has a stud built onto it to mount the tube.
The parts you're looking for are:
Screen, tube & cover assy
D9TZ-6622-B
Fits 77-79 F150-350 w/ 400 & 4WD
Unfortunately I couldn't locate any at any dealer or obsolete parts supplier.
Bolt, main bearing
D7TZ-6345-A
NOS Parts Source, Olathe, KS has 1 (913) 220-5746
Watson Motor Co., Clovis, NM has 1 (575) 762-4551