All I can say is I'm going with a 700R4 because I got it cheap, still need a converter though. As for a 350 Turbo, The shop I had build my last one gave me an unconditional 100% parts and labor garantee, 6 months street car, 1 year trailored race car, that I could not break it. He claimed he put them behind 800 Hp BBC all the time and had not lost one yet... Of course he built the tranny for the "Grave Digger".