Help me figure out what drop I need

[superdav]

I want a raked drop and I have searched but haven't found the pic of one with that drop and wheel size/backspace to know what it would look like and just buying parts is an expensive guess but I want it to be lower with a rake and the tires in the location pictured. What drop can I do?

I was thinking 2 or 2.5 inch front and 2 inch shackles in the rear

Here is a pic of my truck at stock height with 15x10 wheels, I'm not sure of the backspace but it is deep