Lifter Bore

O.K., here we go, I am rebuilding a 71 340 engine. Today I was putting in a new cam and hydraulic lifters when I discovered that the bore on the driver side next to the fire wall was very lose!, about 8000-10000 lose. I went to the machine shop and asked the machine guy what he thought, he said it was a "no go" !
He told me that at one time Ma Mopar was selling over sized lifters, but no more that he knows of. He said that I might find something on line that might address this problem. I am hoping that someone on FABO could give me some direction.
Thanks, George Hinkel