360 build recommendations please...

I'd say build it to drive, and see what it runs. You might be surprised. Not every 12 second car really runs 12s...lol A decent street car runs 13s. A fast one runs low 13s high 12s. Low 12s takes a lot of power, very little weight, or less streetability in a stock stroke small block. If you've never driven one, mid 12s wil probably scare you at first on street radial tires. The 904 will be fine. I dont like stalls higher than 2500 on primarilly street cars. They ruin drivability, they piss away fuel, and they make a lot of noise for not much pull, unless you floor it. You want a stall speed at or lower than the typical high gear cruising rpm. In 3.91s w/stock rubber's case, thats about 2500 at 60. with most convertors, cruising at 45mph in 3rd, with a 3800 convertor and street gearing, will feel like a wet sponge, and every hill or time you try to pull away, it will feel sluggish. And yes, I have lots of experience with Dynamic's "tight 9 1/2" convertors. Tehy are head and shoulders better, but still not what I would want for a car that hits the track a few times a year. Always go more gear, less stall, for a car you want to drive.