69 427 Engine ID CE077733 - Dana? Gibb?

[TrinityDave]

I have had a 427 BBC in my Mandella Ski/Drag Boat for the last 30 years. I traded it for a Blown 327 that was too much hassel for "family fun" weekends.
The guy said the 427 was a 425HP version, only a month old, and never opened up. That was in California in the early 70's.
Tearing it down last weekend after 30 faithful years of summer skiing, I found the VIN to be CE077733 & Block date coded L.18.9 Casting number 33963512. The heads are 3873858 with 1.14.5 & 1.15.5 date codes. It has a 6223 crank that is still smooth as glass & arrow straight. The casting numbers on the aluminum intake were polished off but it has a 10.29.65 EJ AN code on the bottom. Pistons are the original forged pop-ups and rods have a single dimple. Cam is mechanical. Carb is the big Holley.
My initial research indicated this was a dealer special order engine sold in early 1970. Could the heads & manifold have sat in the factory for 5 years before being assembled? Is this the same engine that Dana or Gibb etc used in dealer changeouts and if so is this engine rare/valuable to someone who needs a "original" dated/coded replacement motor?
Even tho my daily driver is a restored a 69 RS SS Camaro 350, I'm not interested in making a clone Dana or Motion car. As a Pastor, the small block tempts my lead foot enough already.
I just hate to waste a rare motor in a ski boat if it might complete someone's unique project.
Whatcha' Think?