Transmission problem in my 89 240sx

[Nvkreationz]

i am really in trouble...i bought an 89 240sx with the engine locked becuase the previous owner drove it with no oil in the engine...then bought a use 91 engine and installed it...now the problem is that it always burn my clutch, even though i just let the car idol...i replaced two 89 clutch set in there all ready and it still burn the clutch..i want to know what the differents between the 89 and 91 engine and transmission and if someone who has the same problem but fixed it please give me some pointers... thanx