Bad running 318

A friend of mine has a 318 in a shunt truck , it is hard starting and runs like crap until it gets warm !! Once they shut it off and try to restart 15 min later it's very hard to start again ,
So they have replaced the timing chain and gears , new two barrel carb , wires ,plugs etc
- they also have an electric fuel pump (with no regulator ). ??? So I figured electric pump is too much pressure for the two barrel ? Also thought maybe the intake was plugged with carbon at the base of the carb ? But then noticed they have a 3/8 line plumbed from the water pump housing into the base of the intake ??? Never seen that before ? Anyone have any ideas ?
Thanks mike