low hp and torque

all right took the car to the dyno to day made 393hp at the rear wheel and 400pound of torque my engin is a 426 small block this is my problem my torque which is a 3500 stall did not stall till 5000 is this normal or is my torque junk and the pull were done with 323 gears car seemed to fall about 6300 rpms but a i had a cupple of friends say they could see tire smoke so i dont know .

my set up 850 qwick fule eddy heads hughs stage one port jobe hughs cam.592intake 610exhaust solid 1.6 roller rockers fully balinced and could youse bigger headers . 11.1 comp ,arp bolts through eveything air gap intake what you think the problem is .