Got the truck to crank today. The avalanche is a flood car and I found that the fuse block under the hood was corroded pretty badly. I grabbed the fuse block off of the escalade and it would click but would not fully crank. I found that the wire coming from the battery to the starter was broken. Again I grabbed the one off of the escaped (nice having a parts car hah) and it cranked.
I couldn't get it to start. I have spark but was not getting fuel. Someone made a fuel tank when they notched the frame for the drop and never hooked it up. So tomorrow I'm going to run new lines and hopefully start the motor swap.