Camshaft identification??

I have built a lot of small blocks and comp is by far my cam of choice. 9 times out of 10 the best cam for the little 273 is the factory 340 replacement muscle car cam, it has the slight rumble that everyone loves. I would be more inclined to go with the xe256 if this is an auto car, with a stick u could get away with the 262, but the 268 will lose that all important torque that we all desire....ofcourse it will sound pretty mean+idle choppy, just like the chevys....all show and no go........kim