Water Lines?

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Hi Guys,

Need a little help sorting out some plumbing issues. I am finally finishing off my project (long story) and I am trying to work out where to run the water lines for the turbo and heater.

It's a built engine using a NA long motor and all custom manifolds and aftermarket turbo so there are no standard lines and I think there might be an inlet missing on the thermostat housing? It's been so long that I can't quite remember how it all works. I have some photos of the original motor but it's hard to see.

SO starting from scratch-

1- I am going to use the part of the original steel pipe that has an O'ring which engages into the water pump which will come out of the pump and from there it will be all custom plumbing.

2- I think I need to run a line from the pump to the top heater line with 2 x T fittings along the way, one to feed water to the turbo and one connects to the smaller fitting on the steel pipe that goes around the back of the engine to the thermostat housing.

3- What is that smaller pipe for anyway- a bypass to maintain flow when the heater is off?

4- I need a hose from the bottom heater line to the larger fitting on the steel pipe around the back.

5- Where should the return line from the turbo connect to?

Can someone please fill in the blanks and tell me if my assumptions are correct?

Thanks

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Anybody? Someone must know this?