1972 Correct Fuel Pump?

[rusted72']

Wondering If I have the correct fuel pump on my 72 c10 with a 350 and an automatic tranny. I purchased a hard fuel line which goes from pump to carburetor but it will only fit the smaller pumps with 2 lines. the longer pump has 3 lines and the hard line outlet for this type is facing the engine unlike the 2 line pump which faces the radiator. Is there a different hard fuel line for the 3 line fuel pump.
If i change pump to a 2 line everything will fit except I now have a return line or vent line dangling.
what can be done to fix this?
any suggestions?

thanks