Nice progress. Told you pulling the tank was a blast
Can you hear fuel circulating thru the intake when you prime the pump? It should be audible. Definitely could be tune up related, mine ran like total ass until I tuned it up, it was only running on 4-5 cylinders, but it did run and idle. Your injectors could be gummed up too. I ran a nasty concoction of marvel mystery oil and sea foam mixed quite heavy in fresh gas for the first hour or so that it ran. My injectors were sticky at first but the freed up pretty quickly once it got the magic elixir thru it.