Sleeving all 8 on a stock block works ok for street engines that are low comp ratio but in a race application even a 3/33 wall sleeve weakens the deck enough that its hard to keep a head gasket in the engine.the center bolts are the problem.we tried that years ago and the deck wasn't strong enough for even a 150 shot.
The stock blocks we have dynoed made more power at .030 over than @ .060 wall flex and poor ring seal really show up @ .060,this was on 13.5-1 alcohol engines.Bill