My cylinders wont fit on my cases ... WTF?!?!?

I was looking at the cylinders cuz i was gona grind the cases but the cylinder sleeves are about 2 or 3 mil longer and i think if i get it in the cases it will hit the crank when bolted down so i dont think i can put them on . and has anyone actually put 701 cylinders on 6m6 cases ? everyone i asked said they would work fine but they dont
 
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