welding milodon sump. Mig or Tig?

Is that an Elko K member ?
If you are really good with your mig you could probably do an acceptable job , but a a tig would be so much better .
I would advise to have the sump bolted down to a flat surface (like the block ) to avoid warpage when welding .
Is it possable to raise the engine a little to reduce the amount you need to cut the sump .