What you've got there is a '77 truck engine, which doesn't make a lick of difference if you're going through it anyhow. Per Chrysler: 7T440E = 1977 Truck 440 with cast crank (E). The pan bears out the truck part, and the crank's parting line identifies it as a cast unit (which you'll never hurt, so don't sweat it).
You'll want to replace those pistons. When I checked my distance at TDC and CCed my heads, my '76 CB300 engine turned out to have a near-7.0:1 static compression ratio as built by Chrysler. Since mine was ultra-low-mile, I was hoping to not replace the pistons. I couldn't comfortably mill the heads or deck far enough to make those slugs worthwhile.
