reconnecting the ABS system after engine swap?

You need the brake pressure modulator valve and speed buffer sensor, I don't see the PCM involved in the ABS system, here is the wiring diagrams so you can see how the system works and how to wire it. Check out the images (below). Please let us know if you need anything else to get the problem fixed.

just for clarification, is this diagram for the 1995 system?

Yep, I double checked it.

I recently transplanted a 5.3 l LS from a 2004 Tahoe into my 1995 Silverado. I am trying to reconnect the cruise control. What do I need to connect to it to make the cruise control work properly?

It's hard to say, you will need to rig something up for the cruise control module cable tot eh throttle body of the LS, here is the cruise control wiring diagrams and module so you can see how the system works. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.

pictures of the progress.
The cruise control mod is out of a 1999 S10 blazer, I got lucky to find one that was long enough and has a small amount of length adjustment.
after market computer and harness. The original harness and computer are still in the truck just disconnected.

On the same truck, I would like to get the ABS system re-connected also.

Nice work, sorry, we only handle one problem per thread, please post your new question here, you must be logged in.

https://www.2carpros.com/questions/new

Cheers, Ken

the diagrams supplied are for which year model truck?

This is for a 1995 chevy truck 1500 2wd 5.7 liter.