Well I've never ran a small block and have never raced with a torque flite but i've raced and broken a lot of 833'S. It will hold up to your 6-700 horse power if you use a clutch that will not hammer the gears out of it and a set of tires that won't dead hook. If this is a streeter no problem it's just when you get serious at the track that the trans will start to give you problems if you haven't modified it to pro shifted or face plated gears. When you do modify the trans it becomes a pain to run on the street, I used to but I saw more damage from easy shifting than power shifting at the track.