When I first did the LT1 conversion, I had no idea what made a Chevy or a Jaguar tick. I wasn't sure if the two body parts were going to be able to communicate with each other. This turned out to be easier than I thought it would be.
The Jaguar has a large bundle of wires that travel behind the glovebox. This is where you will mate your connections. The wires you will be connecting to come from the C204 and C205 connector which comes off of your LT1 harness. They are big multi pin connectors.
The wires that will be used are listed on my integration chart. The more complicated stuff will be listed later!
