Given that
@CrimsonKing70 already has an appropriate motor for the Spitfire, then we could assume that the larger motor is proposed as a "what would happen" option. I think the only reason to put 900 watts of 2300kV motor into the Spit is to go fast - very fast. With this in mind, a couple of thoughts.
The motor is rated for 6S max and ~45A max. I would think that a 6x6, 7x6, or 7x7 prop would work. Starting with 3S I would try the 6x6 first, on the bench with a watt meter (with sufficient protection for you and those around you) and only increase to 7x6 or 7x7 when you know you are significantly below the 45A max limit. Repeat the process for 4S. For the props I would suggest genuine APC E props (rated to 37K RPM for the 6x6) or better as
@Hai-Lee suggested.
On the weight, the motor is just over 6 oz and a 2200mAh 4S is another 7 or 8 oz. With the ESC you are probably adding a little more than a pound to the plane. I think the plane will handle this but you will have to chuck it really hard at launch to get past the increased stall speed and you will have to keep the power on and keep it moving fast - there will be no slow floating around with this one. Also, you will need to reinforce the wing spar with some wood / alu / CF. Without this the wings will very likely fold on the first hard bank and yank.
As long as you don't exceed the motor power ratings (no fire), use an appropriately rated prop (no shrapnel), and have plenty of remote space to fly in (no liability), then sure - give it a go.
EDIT:
Here are the numbers for a stock spit, my GB R3 (which is heavy, has small wings, and is reasonably fast), and a heavy Spit (1.5 lbs added to the all up weight). Should fly fine if you can get the prop and power levels sorted.