Which Trans Question

[tesgt350]

If you were Tracking a 65/66 Mustang with a 347 450HP V8 and had the Top Loader 4 Speed, would you change the Trans out?  if which of these 3 would you choose:  Tremec TKO 500 5 Spd, Tremec TKO 600 5 Spd, T-56 Magnum 6 Spd or a T-5 5 Spd?  If none of these what would you go with?

[SFM6S]

A group of four of us open tracked a 65 coupe with a 347 small block with about 425 HP. We had a close ratio top-loader and used a 3.70 traction lock. All four of us were happy with the performance and never really thought about swapping out transmissions. Driver ability ranged from aggressive to technical to spirited.
Joe

[tesgt350]

A group of four of us open traced a 65 coupe with a 347 small block with about 425 HP. We had a close ratio top-loader and used a 3.70 traction lock. All four of is were happy with the performance and never really thought about swapping out transmissions. Driver ability ranged from aggressive to technical to spirited.
Joe

Thanks for that info.