So, you don't have the timing set and you don't have the choke set, but you want us to help diagnose a hard to start when cold issue. Those two things right there could be HUGE issues why it is hard to start. Get the choke set correctly and then get it running and up to temp and set the timing. Don't just set it so "it runs good", set it correctly for how the engine is built. Since we don't know that, it's gonna be a tough one to guess. Maybe you can give us some details on the build?