increase HP on a 273

Mike...I hear lots people recommending the E-4 cam. Can you tell us how it "feels" (drives) compared to, say, a stock Commando setup? Whats the idle quality like? Low end torque? I'm getting a pair of "302" heads done as we speak for my '67 Dart 'vert, and was considering a cam change at the same time. Is the E-4 a hydraulic or solid cam?

Thanks for the input.

My drive train is scattered throughout 3 counties about now so I can't show what it will sound like, but Jim (MVR Corp) put one in his Dart/273. It has a great sound. http://www.forabodiesonly.com/mopar/showthread.php?t=72278&highlight=Isky Read through his post for details of his build. I have spent days on the Desktop Dyno program I have experimenting with different cams and specs. I tweaked the stock cam specs and improved the torque and horsepower. I was just about to contact someone for a custom grind and then somone mentioned the E-4. I found more info about it on the Flatlander Racing and the Isky website. When I plugged the specs in the dyno program the torque and horsepower were
an improvement over stock and pretty impressive to about 5000 rpm or so.
By the way, the E-4 is a solid lifter cam. There's lots of solid lifter cams for small blocks out there but most are for racing and don't produce much torque and develop their horsepower at 6000+ rpm. That's not what I wanted.
BabyBlue 66 also has a 273 with a performance cam. http://www.forabodiesonly.com/mopar/showthread.php?t=80039&highlight=toolmanmike His sounds great too!
Check out both of their posts and see what you think. A fresh 273 with a little cam and nice sounding exhaust is what I'm after. toolmanmike