LET'S TALK TECH-BIG BORE REC PORTS HEADS ON A SMALL-BORE 4.8L/5.3L

HOW CAN YOU RUN THE BIG-BOY REC-PORT LS3 HEADS ON A SMALL-BORE 5.3L? IF YOU CAN, WILL THEY MAKE MORE POWER THAN THE 706/862 HEADS? (OR 799)