If you plan on doing 64 long rods set up, yes you do need 64 block with 86.5mm STD or 87mm .5mm oversize pistons to suit the 156mm rods,
With 156mm LR, they have better rods ratio then the 150mm.
The pistons I’m selling is only to suit 2.0LR with 156mm rods or 2.3L with 63 block and 64 crankshaft with 150mm rods