440 what am I missing here?

Yeah, you’ll need some big drag radials or slicks before you have to worry about the converter, your highway cruise rpm at 65 is close to 3000 rpm. Your gear and tire combination at present is like 3.91-4.10 gears with a 28 inch tire. I don’t see those tires lasting very long at all. As in, good luck getting it to hook. You’ll be able to break those tires loose at any speed with the throttle when it’s right.