Cab, they were available from 60 to 64. Hp ratings were 390 and 400. Mike at Nikes Garage rebuilt a 64 413 out of a 300k that was factory equiped with the 390 Shortrams motor, it also featured a pair of factory cast iron headers. His final hp and torque numbers fell way short of what they should have been. He bored it to 426ci and replaced the factory flat tappet solid cam with a hydraulic. Either the cam was ground wrong or was installed incorrectly.
He's got a YouTube show that's pretty good. He also dynod a 440 with a set of Long rams and a mild hydraulic roller cam. His single rotor dyno couldn't hold the motor at a low enough rpm to record the maximum torque figures. If I remember correctly, the lowest the dyno would hold the motor was 28-2900 and the peak torque was something below that, it was around 570ftlbs at 2800.