Got an 83 Ram Charger with a 440 today!

I have attached two pictures of the pump with its small block brackets still attached as well as the pulley.
The dat pad on the front of the block said the following and I decoded it accordingly, 6T440 TE (at top of pad) and 12 3 (at bottom of pad).
6= 1976
T= Trenton plant
440= eng size
T= truck
E= cast crank
12= December
3= 3rd of month

Also got the following cast numbers off of the passenger side/bottom of the block; 9 25 75 (first line), 4006630-440-7 (second line), and just below all this was, DN. Any ideas what all this means? I'm thinking the block was cast on Sept 25, 1975, and was then assembled 3 December 1976? The guy said it came from a 77 motorhome.
You're info looks good. The D/N is for Day or Night shift. There should be an arrow pointing toward one or the other. I think the valve covers have been changed. I believe all the '76-up 440's had the tall covers and usually with a heat shield on the exhaust side. If you're thinking of changing the carb, take a good look at that stock intake too. They're really prone to cracking. The most common spot is the web between the secondaries but also check the EGR passages. A crack in the secondaries is not a problem until it migrates down through the floor of the intake. Then the engine will run rough, lean, and hot. Of the 200+ 440 thermoquad intakes I've magged, I've only found 3 that weren't cracked! Of course we're burning that eco-piss oxygenated fuel here in Ca. that raises the exhaust temps 40 degrees so that is to be expected I guess. Gee, I wonder why we're cracking exhaust manifolds??? :banghead: