Small block TrickFlow heads part 1

Ok finally got this flowsoft program up and running. Windows 10 sure did make things harder on an old program like this. Ok I checked calibration with a 300cfm plate and as always it checked in at 299-301. My bore adapter measures 4.015 and TrickFlow says they use a 4.000 bore so that’s close. Real close. My numbers are on the left and TrickFlows advertised numbers are on the right. I expected close numbers and as you can see they came in close. These heads should make power BUT I’m going to show what I think is holding them back some. Hopefully it can be addressed. View attachment 1715801534
Looks like your bench (and theirs) is calibrated pretty close.