I have a custom 239/245 hyd roller in my 496 that is nice and smooth down low but makes 610 hp and 630 torque. My last engine was a 512 with a 246/246 hyd roller and it was a little lumpy at 900 rpm and lacked a little bit of torque down low which is why I built a new engine. It can be difficult to get the correct cam when you're looking for good street manners. You might need to try at least a couple of cams before you hit the target. Most engine builders are interested in peak power so when you ask them about a smooth idle and good street manners they might not have a "go to" cam for that.
