Some of you have seen this before but I thought I would share. We recently had this 69 428 SCJ rebuilt for a car we are doing (and yes the valve covers are for transport)
Now take a look at the back of the block. It has 66 - 427 cast into it and the bosses down low for a side oiler pressure valve and spring. It also has the C welded on it as it should
Remembering that these blocks were cast with several sand casts put together - apparently they had a leftover end piece and went ahead and used it. My engine builder has seen 390s with the cross bolt main bosses that were unmachined. Never say never with Ford!!
Dave