Yo Yo i would give you $500 for the engine(if it includes all ancillaries/components?), probably $300ish for the box if its all in good running order w/clutch.
I have been offered a fuel injected 18rgeu with everything, even fuel setup+ standard ecu for $500 so i wouldnt want to pay more than this.
What are the details of the engine's history? like how many k's has it done and how has it been treated? when was it last rebuilt?
Thanks