340 Blocks Need Sleeves

I have a 1971 and a 1973 Mopar 340 engine block. Both of them have been bored .040" over. Both of them need one sleeve replaced. One is busted badly and the other has one deep gouge in it. Are these blocks worth repairing? How much does it cost to have a sleeve replaced? If the blocks need to be bored again to .050" or .060", will they still be strong enough? Just wondering whether to fix them or take them to the crusher. I have the cranks and rods for both of them and 7 pistons from the one that busted.