id like to know which 2.4 blocks cant be used
 
All 2.4 ld9 blocks can be used from 96-02 
        
I Love My J ♡ 
 
 
To make your life easier what year is your car. 96-98 or 99-02.  Stay with the block that the car has. if you have a 01 use a 99-02 block.  
Some 99s are actually 98 blocks in N-body cars.  Just a heads up.
PRND321 Till I DIE
Old Motor: 160whp & 152ft/lbs, 1/4 Mile 15.4 @88.2
M45 + LD9 + 4T40-E, GO GO GO