Which Cam do you like?

If you want sound, there is no better cam than the Comp Thumper. I would use the smallest one based on your info and usage. What puzzle's me is your idea of mileage. If you want mileage than don't use a cam that's going to have the "nice sound" The nice sound comes with a price! So my friend what's your poison; sound or mileage? I also agree with rumble fish: 4-bolt main? Yeah that would be a T/A or race block or something. Take some pictures of it including numbers and such. Somebody here will identify it.