Are you building the shortblock or is it stock compression?
What do you consider "low end" power?
With 264 you will lose low end even more with the 272s. The real question is how much low end are you willing to give up for a kick in the pants a little higher in the rpms?
What redline are you planning to set? That should also be a big factor in determing what cams to run. You probably won't be able to fully reap the benefits of 272s unless your reving to 8k or above.
264 should be a good choice for stock or nearly stock redline (sub 8k) on stock compression.