No "3000 stall" needed for mid 13's. My same 360 I listed above is now at 12.8's @ 104-105 mph still running the factory stock torque converter and 3.23 gears, and it's a open rear end. It does have the "black friday sale - under 700 bucks fully loaded to my door" speedmaster heads (untouched) and is down around 3350 lbs at the line. I'm still running the factory stamped steel rockers LOL
My logic on the higher stall is because of the weight of the vehicle. This isnt an abody, and realistically im guessing on the weight. Im gonna venture its probably closer to 3800lbs with me in it, but i really dont know.
Good to know the factory rockers work on those heads, was part of my plan as well