Port Manipulation of Analog Pin A0-15 as Digitial Output Pin 54-61 (Mega 2560)

Looking to use A0-A7 as digital output pins54-61 . Is it possible to use port manipulation to set these? I tried using PORTF = B11111111; to no avail.

References
Port Manipulation: Arduino Reference - Arduino Reference
Port Mapping: https://spreadsheets.google.com/pub?key=rtHw_R6eVL140KS9_G8GPkA&gid=0

Thank you for your help.

Nevermind. My code was correct:
PORTF = B11111110; set A0 Low; A1-A7 High
PORTK = B11111110; set A8 Low; A9-A15 High