The Hughes cam looks like it would be the better of the 2 you have listed, but why are you going to use a 440 source heads? If they are the same flow as the Eddy's your not going to get the performance out of them that you think, as the low lift flows are down a good bit from what they really need to be. I think that you would be better off with a good set of factory castings with smaller port runners, this will give you better port velocity and a stronger signal to the carbs. It will make it easier to tune also.