[vettestr]

All 8 holes is a no no for sleeves. The deck becomes unstable and % of failure is too much to risk. I will not even sleeve side by side on same bank for that reason even on the most exotic or rare blocks because having to eat $$$ if motor fails, not to mention pissing customer off is not worth it.
Not to say you do not have options. Today all the bore and stroke combos have made parts available to become very creative. Mic. the block and determine how far she will have to go to clean up. Then sonic check to see if block will allow the bore needed. If math works out with or without 1 or maybe 2 holes sleeved then look at cost to do what it will take. Only you know if it makes sense to SAVE this block for money invested. A good machinist can do wonders but do you want to pay the cost? Remember all the exotic stuff is $$$ and will also need a balance job that will need heavy metal at about $150. an inch. Hand grinding the block to allow big stroke clearance is very time consuming and $$ if you pay to get it done.