Firewall to engine rubber seal

Hi Guys, I am having a little trouble with my firewall seal. When ever I install the engine it seems to catch the seal and not sit properly.
Question is: Does the firewall seal sit on top of the engine tin (therefore pushing the lip of the seal up? Or does the engine tin but up against the tin (effectively pushing it down due to it's curved shape)?

It seems to snag my throttle cable so I am quite sure I have down it wrong. It sits very close to the top of the trAns so it will be difficult to get the engine up and under it. I think I am destined to undo the engine and reinstall third time 🤪

Please help!

Cheers Peter.