commando cam .. how much will it take with stock specs ?

Torque is basically cid and VE. Most decent engines will make about 1.15-1.25 lbs-ft per cid. And the higher you move that torque up the rpm ladder the more hp you'll build.

The main limits for power is the head and cr.
The stock head is good for at least 300 hp maybe 325 hp with the right combo. The stock cr might make it hard to make above 300 hp.