Mini; The curb and footing under the old barring wall was designed to carry the load evenly spaced over the entire length and now you are going to drop half of the load in a 4" area and the out side foundation wasn't designed for any of this load. I hate to sound like a broken record but if you don't want to hire an engineer, you would be better to over kill it. The outside walls will only be taking 10 to 20% of the load but I don't know enough about block to give good advice.
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