Doing LS Swap - I have no idea what I'm doing!

[EagleChief]

Also, on a separate note - the shift linkage. I "think" what I have will work, but I'm not sure. I had a 700r4 that was previously in the truck. Will my shift linkage connect to the 4l60 that I have now?

When I was running my fuel lines, I held the linkage up to the transmission, and it appears to fit. There is a bracket that is attached to the frame for the pivot point/lower connection of the linkage. So, I know it will connect to that. I just don't know if it's the correct set up to attach directly to the 4l60 connection - even though it appears it will. And, if it does fit, will it work correctly?