Where's the Wow?
It's a completely stock bottom end, didn't take it apart. So factory pistons.
Then the 8.4:1 SCR mentioned earlier is about right. I am not 100% sure that your cranking compression check is accurate; gauges can be off. I would expect 135-140 psi. Cranking compression would read higher if the cam is timed too advanced, but then your torque sounds low overall from your description of symptoms, and that would be the opposite of a too advanced cam.
DCR will be right at 7:1 with the cam timing straight up as ground, or a bit less, so it on the lowish side; it's not really a torquey-at-low-RPM's compression setup. (But you did the best you could with those pistons!)
What stall speed is your convertor?
Car weight?
Any smoke out the back at high revs when the engine is warmed up? Any oil on top of the valve covers or in the air cleaner after runs at the track? (I am just looking for clues to a weak ring seal when actually running.) If the rings are weak, and the tops rings are getting oiled, they will show up decent numbers for cranking compression tests, but not seal well when under real running pressure. A bottom end this old could well have sticking rings in it too. I am really suspicious of the bottom end; cross-hatch is just one of many elements in a good piston seal.
