Cool find! Seems odd to take a small block AC car to do the 427 conversion to. I was looking at the work order and which part of the order specifies the 427 conversion? I see lots of cool parts and some high dollar amounts but I didn't notice the specific conversion wording. And it's really odd to see a block cast in Sept 68 not get built until Mar of 69. But the date obviously lines up great with the April 69 conversion. I still find it amazing people hold onto cars that long without using them much at all but it makes for some great finds and great history!