my buddy with the trickflows on his stroker has that nice 264-268 Hughes solid. 620 ish lift with his 1.6’s.
Its done at 6500-6600 running 1/4 mile. Good gear for the combo i think
So i think you are correct.
OP i think has a 28 tire and 4.10 gear, shouldn't get past 6600-6700 i wouldn't think.
Be curious to see how his convertor works. 5600( if that is where it indeed ends up) seems a bit much to me, but i could be wrong..it for sure wont be WAY off.