Got a major problem on a "new" motor.

I blew my motor one month ago and bought a j-spec from another forum member to replace it and just get my car running. Everything is hooked up and we got it running. I filled 1 gallon pure coolant, and 1 gallon water. Now I am heating fast, my add coolant light is on and my heater isn't blowing hot air. Also, my oil and block are baking and the oil is totally white (it even shot out of the filler neck). My radiator and hoses are cool, and the water pump and everything else is very hot. It's safe to say my t'stat isn't opening. It's brand new, worked on my old motor before it blew (I only ran about 25 miles perfectly until I exploded). Now I need to know how much I effed up this motor. Again, the radiator is cold and the oil looks like milk now and is extremely hot. I should also note that the oil pressure is pegged, don't know why (it did do that when simply cranking too).

Any ideas what's going on?

At least it ran...

 

white oil= antifreeze in the oil. I'd say blown coolant seal

 

+1 time for a rebuild

 

Yeah I figured that much. Looks like I picked up a FUBAR replacement motor. Now I have a TII with TWO blown motors. Time to sell it or part it out