Competition Industrial Block

[DieselBoy109]

Hello, i have question about the heavy duty 24/7 industrial blocks. I hear of big time pullers use these to hold the massive amounts of horsepower. I want to know what is so special about these blocks, thickness, different styles, and wat is special about the internals if they are any. I want to build a motor that will hold at the minimum 1000 horse, and with all the money tied up into it i do not wanna scattered it. I have the oppurtunity to buy a industrial running motor for 2500 dollars with 800 hrs on it. Does this seem fair? All i know is that it has a rotary pump on it. Any advice on the build and which direction i should go would be well appreciated. Oo.