I am looking to repair a foundation wall for my addition. Its 40 feet long and 13ft deep, I am thinking of run?

I am thinking of running a header beam along the floor joists the whole 40ft and using 4 40 ton jacks along the front of addition

Also running a header beam almost in center and useing 4 40 ton jacks. Plus use 6x6 also to help keep it up/stable near where bottle jacks are.

I am also going to in the ground for jacks and supports going to make a concrete pad or something for the jacks to stand on. Because the ground under addition is dirt..

I am doing this because I need to dig and put a footing 4ft down and new block. The house is older and no footing was used and the slate stone, or cobble stone fell down and one part of addition is sagging..

Am I on the right path with this??

Is the addion going to fall down??

Any ideas or pointer would be helpful!!

Thanks