Help tuning mystery motor?

shift points? stall on the converter? Are you getting full throttle?

Yes on the full throttle. I have check and verified that several times.
As to Stall, That is another unknown but it is definitely looser than stock but I am not sure .

I have been leaving at about 2,500 rpms and have a digital shift Light tach. Set at 6000. The second to third shift light comes on right as cross the finish line so never getting to High gear.