I have a 1969 cast date 340 block. Stock bore, untouched. Been tanked, pressure tested
magged, and sonic tested. I have the sonic test somewhere. Amazingly little core shift. Will clean up at .020. Had planned to build a 414 stroker. Got seduced by a 6.1 crate motor. $ 500 o.b.o. I'm near Barrie, Ont.