When you see a power curve like that Grays build has....... where the tq number is quite a bit higher than the hp number....... you know the motor peaked early....... which means it didnt have “enough” of something to allow the curve to hang on longer.
Whether that’s duration, lift, flow, carb, header....... or maybe it’s lacking a little of several of those factors.......something needs to be changed to allow that nice big tq number to either be moved up the scale........ or taper off at a much slower rate.
Most builds that make “impressive” power....... have noticeably more HP than TQ.......... because the tq curve is hanging on higher up.