chassis dyno

I have s super stock witha 2bl motor… it has an automatic trans… what would would the HP difference on a chassis dyno be ,if i put a 4 spd in the car??

may be a few percent = 100hp = a 3 0r 4 hp differance

the fastest super stock out there is a auto

fastest super stock

whick shop prepares the fastest super stock?? i need faster laps times

sade sandford auto deler exchange has some of the fastest super stocks in the fascar bunch