So I took the instrument cluster off and along the left hand side there is what looks like a flasher holder mounted on the side panel and behind that was something with 5 male flat blades(green) and marked motorcraft, tangled up in the wires under the speedo was a female connector(red) that seemed to plug up nicely.When I got the truck a few other things were unplugged under the dash too. So what did I just plug in? Thanks!

 

That's the seat belt warning module.

 

oh haha maybe I will unplug it then thanks man!!

 

How do you replace rod bearings in a 1978 351m is there a certain way the bearings go in and is there a certain way the caps go on.

 

Wow random! What does that have to do with the OPs question?

 

agreed. i also suggest you get new piston return springs if your going to have the block apart.