Where are you located?
Will you be adding the d24t with turbo in to the 240?
You might need one of these..
http://www.d24t.com/showthread.php?t=1134
So far there are 5 240 turbo diesel volvo's running around with my custom oil pan with no issues!
I can set you up with a "drop in" turbodiesel for your 240 if you want.
Or you can just add the turbo to your d24.