Will a stock 8 1/4" SG with 3:55's hold up??

Rumblefish, I have ATI build my converters. I sure you are very familiar with what is needed for a custom converter. They base it on HP/TQ, cam specs, weight of vehicle, tire size and gear ratio. 4 out of 5 I don't have yet! lol Thanks for the info. Just curious, why stock tapered not greens? Side load?