I wouldn't call it "smooth" and it sounds great to me but the cam isn't that wild. It's a custom grind single pattern cam from Mike Jones Cam Designs with a 108 LSA, 226 degrees I&E duration and .610" intake lift with 1.8 ratio Scorpion roller rockers and about .585" lift with 1.75 ratio exhaust rockers. I didn't want a high RPM cam for this engine because it's strictly a street engine (6000 RPM max), so I wanted a lot of torque down low and to run well at 5000 feet elevation. So we went with a pretty early intake closing angle since the engine only has 9.7:1 CR. He tells me I should get over 600 ft-lb of torque and a wide torque band, which is what I was looking for.
I'm trying to get a video of it with better sound quality. I didn't realize it was that hard to get decent sound reproduction from a phone or camera. I took another video today but it's still not that good, especially through the mufflers (which sounds great). I'll try again tomorrow.
Thanks y'all!!