[mickmate]

If it was me I'd sonic check the walls. Base your decision on that and only sleeve what needs it. These motors are compact lightweight powerplants revolutionary in their day because of the precision thin wall casting methods employed. As a result of the thin walls if they sat around for a long time or were left partially filled with coolant they would eat the walls through from the jacket side. I went through radiators, motors and head gaskets till I discovered a vertical split in a cylinder wall due to this. I wasn't sonic checking, I'd start there. Good luck.