About double the weight

Theres a weight chart of datto engines somewhere

KA will fit... hey anything will fit
But if $300 for an overpriced clutch is an issue then the big dollars required to modify the tunnel/floor for the bigger gearbox... the cost of a larger diff.. cause you'll need one very soon... etc Well thats all going to be a bigger issue

I'm sure I have a spare clutch here somewhere... or I can get a new one from work
Depends what your after

Might pay to get the car and see what you need before we start freighting stuff to the other side of the world