Help! Wiring & fuse box

[Nitschke]

2009 LY6 and 2010 6l80e going in 72 pick up the harness is from a 2010 6.2 afm motor with 6l80e. Im to the point to do my harness and am completely lost i have the motor/trans in the truck and put the harness on all the plugs that are on the motor/trans but there is a lot of extras that have nowhere to go? Also what can i do for a fuse box can i use one out of a 90s chevy truck? Im very overwhelmedill post pics later to day. Thanks for all your support!
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[scss02]

lt1swap.com has most of the info you need including fuse box info

[BR3W CITY]

IMO its best to remove the AFM from what I've seen. The displacement on demand feature get kinda wacky with swap cars.

lt1swap and LS1tech should have most of what you need if you poke around and the swap section and some of the diagrams they have posted.

Fwiw, you can always go with an aftermarket fuse box. I did with my harness and it worked out well, it save the hassle of having lots of unused or re-used fuse spaces, and its expandable to allow for changes and additions to the wiring.

[68GMCCustom]

You can save yourself a lot of coin by working your own harness. But for some folks its either beyond their skill level, or they don't have the time or patience, or just don't want to. For anyone in any of those groups...its simply a better solution to have someone else rework their harness or buy a custom one. I got lucky...my efi setup was part of a trade and they provided a custom stand alone harness.