compression
the compression is way to low and the cam is to small your taking the 434 out of its working band and a 434 is a high rpm motor were you shifting at and how much torque did the motor have sometimes on a sbc the hp is lower than the torque number we ran best time 6.22 in a 2800lb car 1/8 mile with afr227's and the engine comp is around 15:1 we have 325 in the cylinders do a comp check most likely your down on comp why guys build a 12:1 race motor thats a trailer queen 14:1 or better