Re: V8 into XF
You dont have to chop either. The clevo is way bigger than the windsor. The winsdor is an easier fit but wiring might be difficult.
With the clevo, you will need to do something clever with the heater pipes as they hit the engine and melt where they exit the firewall. Putting a 90degree bend on both pipes would fix it.
I put a cleveland into my XF around 6 months ago.
Twin Cam EA falcon
SWB Ford Maverick