I knew I had a set of those in my stockpile of cores, so I just found it and looked at the casting number, 14079261 (oddly long), which means 84-88. Uses perimeter bolts, standard intake flange. The range of years doesn't tell you if it's a one piece seal block or two, or two or 4 bolt block, but I am pretty sure I took this thing apart and it was a one piece seal and 4 bolt block, so it came from a truck of that era.
I haven't touched the heads, but I would expect them to be on par with something like an 882 head and they are a lightweight casting. Not sure if they are crack prone like the 882's or not though.