Race car mystery-Help us solve PLEASE

New dist.New wires,new plugs,throttle cable checked for full opening of throttle plates,Brand new 7Al-2 ign box,New complete wiring and grounding in car,Checked timing 13 initial and 34 total,We are going to see if the cars like more timing but till we get the rpm's back don't think i would adjust the timing yet,Brand new complete fuel system,-10 lines and holley black pump,fuel pressure stays strong down the track at 7.5 to 8 psi,float levels checked in the carb.