I put head gaskets and timing chains on now its not firing

Your concern description and repairs performed leave a whole lot of wide open questions that make it impossible to help from a Q&A forum. You'll need hands on inspection with proper diagnostic equipment and shop manuals for reference to first see if you have an anti-theft problem with the key. Then, once this is eliminated, you'll need to check engine compression, engine timing, ignition spark, fuel delivery and air intake. My guess is that more than one problem is occurring here, especially now that the engine has been partially disassembled and reassembled without any sense of whether there is a failure present that needed repaired or not in the first place.