Sonic test first. Many can go .070 over.Back when I had my shop I saved a lot of used up Hemi blocks. Did them with a Kwik-Way bar.I used a very thick sleeve and had about.255 wall before honing .005 on the CK-10 to stock bore size.At that time I used Nylen sleeves but I never had any issues (I think they were some sort of iron mix).Procedure was do only one cyl at at time on each bank skipping over the ajoining cyl. So I would do #4 flip it do #5 flip it do #8 flip it do #1 etc.1/4 inch or more retainer groove at the bottom of each cyl and about 1/16 sticking out the top.Filed and stoned off excess continue to next cyl.Green Loctite sleeve retainer to seal off the water.Squared the block afterwards.Worked very well even on paper thin pro stock blocks.Lots of work and time.This procedure seemed best to prevent the block from twisting much and they were very easy to square up.BTW back then it was $400.00 incl sleeves.Should be much easier now the the modern equipment.