Transmission Problem in 89 240sx HELP!!!

[Nvkreationz]

i am really in trouble...i bought a 5-speed 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

[Nvkreationz]

more detail...when i drive the car with new clutch it drives fine until 1hour to 2hour later the clutch start to slip then if i keep reving the car the car the clutch wears out..after that the car is not drivable no more even though i wait for the car to cool down down...is it that i need a 91 clutch set becuase of the 91 engine...also my slave cylinder always leak for some reason.. thanx for your help