400 block number 1 cylinder thin area.

I have STD Bore 1978 year 400 block to stroker build and now checked cylinder walls and number 1 cylinder has thin spot on about middle of bore maybe bit below on lifter walley side. Its about 11 a clock if you watch from drivers side of block. Thickness there was just about 0.100 but if i move to 9 a clock or 1 a clock there is about 0.180-0.190. Also If i go down from that Area about inch there is about 0.200 and up ab inch its about 0.160. Other bores was fine to go. What i should do? Fill it up with hard block to Waters pump holes? Sleeve that one cylinder? Its quite hard to find blocks from Finland and they are quite pricy and those can be even worse. Engine will see street mostly about 90% of time.