I'm thinking about installing a new LS3 in my 1971 C10 and here is some LS engine swap info that I have found ...
LS controller kit include the following items:
19166573 Engine Harness
12576410 Mass Air Flow Meter
19166574 Mass Air Flow Meter Mounting Boss
10367117 Accelerator Pedal Assembly
12581966 Oxygen Sensor (Qty 2 Per Kit)
15156588 Oxygen Sensor Mounting Boss (Qty 2 Per Kit)
19171935 Instruction Sheet
https://store.gmperformanceparts.com...!--19201327-->
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Motor mount kit to swap a new LS engine into an older musclecar/truck:
http://paceperformance.com/index.asp...OD&ProdID=9072