when i was looking to buy and 240 sx i found alot of them in cali with sr20s already in them..
my sugestion is dont buy some one elses project. i wouldnt buy any used turbo car for that fact. Most of the time you'll find out down the road that they have been abused and will cost you an ass load in repairs.
and if u want a fast car the ka is a damn good motor to work with. take the money you would spend to get the motor have it installed and the various goodies you would want. you could take that and invest it into the ka, ie. get it rebuilt turbo and other things and have a whole lot more car for your money and since you got the stuff and had it installed your self you wont be worried about when shits gonna break.
plus the ka is a better dragger