273 commando HELP!!!

Stock 4bbl cam is mech 248/248 duration and .415/.425 lift.

The Isky E4 Part no. 390144 is 260 (216@50) duration 425/425 lift.

Low end goes away pretty fast with a very big increase in duration with the 273. The D-Dart used a 284 with 500 lift and it idled like a purpose built race car. Even though the Isky E4 is advertised at 260 the .050 numbers (216) are fairly mild and a 273 idles well, retains good driveability and raps up nicely. FInd a cam with near that duration and you'll like it.
Stock 2bbl cam is mech 240/240 and .395/.405 for comparison purposes.Sorry I can't tell you what the factory cams were at .050......