Best exhaust for 318

I have a 1967 318. It has 3" headers on it, but we will be reducing it to 2.5" so it isn't too large. I would like to know what kind of mufflers to get for it. Will have no cats

1) I'd like it to be less agressive/ more mild, but hear it at WOT. (Im getting cutouts, so no need for it to be too loud of a muffler)

2) Deep rumble when idling and able to hear choppiness of camshaft

3) H or X pipe?

Last, if I want the cutouts to imitate open headers (sound and loudness) as well as possible, where should I place them? Right after headers?

-Kameron