You can get the block bored out to 86.5mm to accomodate your pistons.
The max the block can be bored out is about 87.5mm, after this you would need liners to strengthen it.
The only thing to consider, is if you cracked a piston it may have scored teh block. This could be more than 0.5mm deep and so when boring the block it may transpire that it has to go to 87mm or so. in which case you will need new pistons or a new block.
best of luck.