DBone,
Running a "39" 216 in my 46, with 4:11 rear end and crash-box 4-speed. She runs like a dream a cruises pretty comfortably around 50 mph with 16 inch wheels/tires.
Similar situation with my 52. I'm running a "48" splash oiling 235 and the stock 4-speed and rear end. She'll run a bit better than the 46, feeling pretty comfortable cruising between 55-60. I'm sure she'd do better, but I'm running smaller 15 inch wheels/tires.
