One thing I don't like about my Cobra

[Marc Wulf]

First let me say it's been a while since I posted anything and was reminded of that the other day.So here it goes! I love everything about my Cobra except the way it sounds at idle.I want that lumpy,hollow,metallic sound.If I didn't explain myself well enough,there's a segment on YouTube entitled original 427 start up I think.Its a blue 66 SC with license REAL1.Thats the sound Im looking for or close to it not having a big block 427!
I know I'll have to start with the cam and maybe even the side pipes.Mine are actually quiet at idle,an airy muffled sound,sorry the best I could do.It sounds great when you give it some gas but not at idle.I know there's a lot of information needed when choosing a cam,so I'll do the best I can.The car has changed hands several times.
Ford 351W crate motor
Edelbrock aluminum performer heads,intake and cam.Don't know the specs on the cam, except that it's mild,too mild for me.
750 cfm carb
Tremec 3550 5 speed
3.37 gears
Power brakes
Weekend driver
Looking forward to any input.
Thanks