I have a set of these pistons too. The compression height is 1.920". I think the stock CH is 1.908". I was curious myself as to how close to the deck they are. Was the block decked? I have a 71 383 with .040 cast pistons, and they are way down in the hole (close to .080 IIRC).

I am getting ready to mock up a 67 383 block to check it for square and to see how far below deck the stock pistons are, in order to see if the L2315 will get me where I need to be. I think the 68-69 383HP piston CH is 1.932" and was close to zero or at zero deck height.

Sorry, I have no idea about the cam. Last cam I wasn't sure of (I knew it was a Summit cam), I installed it in an empty block and checked the lope lift with a dial indicator. Figured out it was the 6400 B/RB cam.