Trouble installing new tank

I just dropped the old tank out of my 66. I had a time getting it out but the seal on the filler tube opening and filler tube finally gave up.

Is there some secret voodoo trick to getting the replacement tank in? It measures the same as the old tank but I'm having a hell of a time getting it to line up and go in.

Can anyone provide me with a little direction before I go insane? I just want to replace the crap electric fuel pump and fuel cell in the trunk and get it the way it should be!

Ant