Stop in for a cup of coffee

Good morning, fellow moparsians!

Last night I removed my heater core. I had a vague memory that the PO said something about it. Maybe he had it fixed, maybe it was new, maybe it was busted.
Anyway, I took it out and straightened out the connection tubes that were crimped around hoses that were long gone. I inserted some air hose, plugged one end and put the water on in the other. Much to my surprise it turned out to be ok! Not a drop came out even at full water pressure which is somewhere around 60-70 psi.

Win!

I flushed it out some. Surprising amounts of brown water came out. Switched direction a couple of times and still more came every time.

I don't like the way most engine bays I've seen have these black hoses going right across the engine from the front to the fire wall. I'm pondering ways to do this in a neater way.

What is the normal water pressure in a mopar small block?