installation issues

I tried installing a /6 motor from a 1967 Barracuda into my 1962 Valiant Wagon today and ended up pulling it back out after destroying the paint on the fire wall, the oil pan, and the K frame. The oil pan will not clear the K frame.
So here is the question I have I looked at the oild pan from the Wagon and it is squared off at the ends and my 67 is rounded so I cannot swap them out so does anyone have any ideas of what I need to do, also which motor mount brackts will I have to use the one off the 62 or can I use the ones off the 67. Lastly does anyone have any suggetions or tips for when I try this again in a couple of days after I correct what I JACKED UP TODAY:)