New engine gremlins - frustrating

Flat top pistons .010" below deck and some fairly standard parts (heads and head gaskets) give an 9.1 SCR, and, with that cam (MP 284 cam as a guess, installed with 4 degrees advance), DCR computes to be 6.9-7.0. (If I am getting this wrong, please someone correct me....)

With a 3.23 rear gear at 20 mph, the engine will be turning around 2300-2400 RPM, around where the TC is starting to lock. From the torque and HP numbers, it would seem that the engine would be coming up on the curve at 2400 RPM. But IMHO, that cam is not going to be a low end torque cam.

Is the low end lack of torque consistent, and separate from the occasional hesitation? If you floor the car at low speed, where does the tach end up as it moves out form a standstill?

You could go up to a 2800 or 3000 RPM stall, but then at cruise at 60 MPH, the engine will be wanting to be at 2600 RPM, below the stall speed for a standard type TC. A rear gear change would do better for you, IMHO.