340 short block

Looking for a 340 short block for my Dad.
He is somewhat computer illiterate so I am trying to help him out. He is looking for a block that has the least amount of overbore (.020 - .030"), ideally. Open to larger bores if we can't find one. Ideally, it would not need to be rebuilt but definitely open to cores. It would just be a bonus.
He already has x-heads and an LD6B intake but he said if one came along complete with x-heads he wouldn't turn it down.Looking for something with reconditioned rods and hopefully not heavy cast pistons. Cam not desired as we will be using a cam for six-barrel EFI and ported X-heads.
He is retired and willing to travel to pick up.

I gave him an early casting 360 but he just really wants a 340. I'll be happy to take my 360 back so I am hoping we find a 340. LOL.