That sounds a bit high for the engine. In central,IL here we usually pick up 6.0 LQ4s for around 750-800 complete from ECM to oil pan with ACC from a salvage yard. Given this is higher output engine, it will need potentially a cam and lifters maybe more. Don't mean to fry you just being informative. Pictures might also help your sale, we all know what an LS engine looks like but thats how it goes...
,Dan