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To complement the 523hp Dart-based small-block in our ’68 Nova, Phoenix built us one of its PTP400SS transmissions. This stout TH400 comes equipped with heavy-duty clutches, a Kevlar band, a 34-element sprag, and a 2,200- to 2,600-stall converter. This setup will handle 600 hp, and at $1,231 it’s plenty affordable. Of course, Phoenix optioned our trans out with its variable-pitch option, which costs an extra $550.