273 commando cam

Art, Here's the E-4 specs from the Flatlander racing website:
E-4 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
If you're looking for a replacement cam for your stocker, this is the closest solid lifer cam I could find.

Schneider makes one a bit bigger that I would like to try:
#14202 Mild idle. 1500 - 5000 RPM. advertised duration: 264 deg. 224 @ .050 .480" lift 110 deg.
I have a 4 speed with 3:23's