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It is definitely a 427 but a 390 would be a oval port 2 bolt main. Go with the L88 for $1000 more.
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I looked it up and saw it was an oval port, and I thought it was also a 2-bolt, but didn't want to say for fear of showing my ignorance!!!
He claims it's a 4-bolt, and I know some 4-bolts were made with this casting number, but I wasn't sure.
Like I said above, we are considering trying to find a 69-427 to put in the Yenko replica we have to get it as close to the original as possible....and this engine just isn't the one, right?