Th350 or Th400...Realistically?

[LongSixEight]

I'm not looking to start a huge debut over something that's been covered already. Just wanting advice for what actually works in our trucks.
I've got my big block out of my old bracket car I'm collecting parts to put it in my 86 long bed. Motor went 10.50-10.80 range in 3000lb car with a glide & brake. So I'm guessing 550-580hp. The truck is just gonna be a little toy to beat on on the street & track a few times a year. Probably shoot for 4:88's & 3000- 3500 stall.

So what would you guys run for a trans? I have a good cooler & an lines already. Also, I have a th350 that works perfect with 75k on it that would be worth building. Since I'll be doing driveshaft work putting my 9" in I'm not even factoring that in on my decision.
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