273 build ?????

Do you want to use a hydraulic or solid lifter cam? The Isky model E-4 (390144) is a great solid lifter cam with specs a bit bigger than the stock HP 273 cam.

[Tremendous torque & good mid-range power. 9-10.5:1 compr. , good idle stock converter. 3.23-3.70 axle ratio. Up to 625 Carb. RPM-Range (2000-5500) Valve Lift (.425 .425) Valve Lash hot (.015 .015) ADV Duration (260 250) .050 Duration (216 216) LC 108 390144 $132] Flatlander racing


Schneider Cams also has a mild solid lifter cam which is a bit more radical.
It is a horsepower cam at a higher rpm than the E-4 and doesn't have as much torque at lower rpm's. The 273 can build some horsepower at high rpm but torque at low rpm is what you need for the street. Max HP at 6000rpm won't do you much good unless you're leaving every stoplight @ 5500. I have been messing with my desktop dyno and have found the E-4 to be the best balanced 273 street cam.
Schneider #14202 Mild idle. 1500 - 5000 RPM. 132F 264 224 .480" .014" 110 44285 $165

With the variables I used for the dyno program, the E-4 produced
322 HP@ 6000 rpm and 322 lb/ft@4500rpm. The #14202 produced
337 hp@ 6000 rpm and 309 lb/ft@5000rpm. (more HP but less torque) Between idle and 4000 rpm is where your engine spends most of its time on the street. Comparing specs at 2000 rpm the E-4 wins hands down.
E-4 97 hp @ 2000 rpm and 254 lb/ft of torque
#14202 80 hp @ 2000 rpm and 211 lp/ft of torque

The E-4, a dual plane intake, headers, and free flowing exhaust should get you easily 300+ hp @ the flywheel and more torque than what I listed above.
(I was using a stock open plenum intake and stock exhaust manifolds with mufflers for my comparison.) Click this link and hear what the E-4 sounds like in MVRCorp's 67 Dart. Scroll down to post #12
http://www.forabodiesonly.com/mopar/showthread.php?p=633373#post633373

I guess the bottom line is you don't have to go too wild to get usable torque and HP (usable is the key word) If you want to go racing or get real radical then use the big cams with the big $$$'s to make it all work. Give me a few minutes and I will run your variables and see what numbers we get..

toolmanmike