I've find out how to do it (I think)
In the slot part of block's cfg file you need to paste this:
slot 0.000 -0.160 0.000 0.000 0.000 0.000 3 ; japanese_engine_block_OUT
compatible 0x0007007E 1;
compatible 0x0007007F 1;
compatible 0x00070052 1;
compatible 0x00070041 1;
compatible 0x00060001 17;
compatible 0x0006000A 17;
compatible 0x0006003F 17;
compatible 0x0008008F 98;
compatible 0x0008009B 98;
compatible 0x0008000A 98;
compatible 0x000800D2 98;
compatible 0x0008004F 46;
compatible 0x000800DF 99;
compatible 0x000800F9 99;
compatible 0x00080041 98;
And in RPK you need to put
parts\engines\MC_Prime_SuperDuty\
parts\engines\Baiern_Emer\
parts\engines\Einvagen_Duhen_Ishima_Focer\
after cars\racers\ line on the beginning.
Also, you need to be sure, that your car is compatible with generic SLRR engines (i4, i6 and v8)