Even the legendary SOHC 427 utilized a basically 'standard' 427 block, of course that was a side oiler block. Some slight modifications were done on the block to allow for
oil drainage from the heads. But what really made it a "SOHC" were the heads themselves. Most side oilers came with steel cranks as standard, certainly the SOHC version did.
I'm sure you won't find any block numbers that would indicate it's status as an "H.R." block or what crank it may or may not have come with originally. It is what it is at this point, a top oiler block. Is it indeed a 1964 block (by the way)?
My buddy has an original 'date coded' 1965 side oiler block, the real deal, which I think is pretty cool. My block is a 'service block' from 1968. I've always thought his was just a little more 'real' than mine.
