360 build in a 66 Cuda

Robb the stall speed is usually determined by the size of the cam. Your 262 cam isn't a high RPM cam so you don't need a real high stall but something around 2200-2300 will give a real nice seat of the pants kick on take off and not affect everyday driving and not destroy the fuel mileage too bad either.

Like Chief said they changed the spline count in 68 so make sure and count the input shaft spline so you get order the right one unless you know for sure the year of your trans.