Starting to wire and ave a few questions

[Iceburgh]

Thanks guys.... to be honest I am not sure what year the engine is. It is a iron block 5.7 that I assume came from a truck. The whole thing was rebuilt with new guts and new intake. The guy I bought it from wired it showed me Dyno info and a video of it running then shipped it.
He said real simple plug and play. If need be I will reach out.
The Haywire is everything for the truck...used them in the past 5-6 builds and always nice to work with, however never have done a LS swap so a little uncharted waters. Gauges are speedhut and according to them I must use the sensors sold with the gauges.'

Where is the marking on the LS to figure out what year it was made?