Wiring, harnesses, and connectors
If you want to modify your own harness there is some good info at LT1swap in the first post. Here is a list of links to places that either modify your own harness or build complete new ones. After contacting a bunch of them and having some emails go unanswered I am having my harness done by a board member
68 short step Check him out for your project
Jims performance is very knowleagable and was the most reasonable. You must call him.
Jims
SPEARTECH
Wait4me
Current performance also has fuse/relay panels connectors and will either rework your harness or build new.
Current performance
LS1wiring harness
Nelson performance
In addition to currant performance here are a few places to get fuse/relay panels, connectors, pins and bulkhead connectors
Pictures of GM connectors
Bulkhead connector
Terminals wire connectors
If you know the connector part number and pin part number this is the place
MOUSER
Fuse blocks
Fuse block wiring kits
Painless circuit boss
Painless
Autotrend fuse relay
The brake switch you will need if you want cruise control
AC Delco D850A