My father-in-law just purchased a '67 notch. He already has a 302 set to put in it, and he's mating it with the stock C4. He wants me to find him a good price on a torque converter (in the 2200-3000 range), but I dunno anything about auto's. What fits? I see different sizes and spline numbers. How many splines stock? What's a good size?