Transmission tunnel type 9 or mt75?

[Shorty]

Think I will just stick with zetec/type 9 as this seems very popular option.
Is there anything that needs altering to the chassis to fit this engine?
I read somewhere that one of the rails needs moving slightly to clear water pump... cant seem to find that post.
Just want to make sure I have a list of any amendments that will be needed from book spec before I start on the chassis