The one i posted about earlier in this thread was actually a 426 wedge block bored .100 to 4.350 and a stock rod journal size of 2.375 using 6pak rods and a 4.500 stroke. At 535 cubes with 906 heads it took a .750 lift 286 @ .050 roller to make power above 5700 rpm.
I see little point in pushing a 4.5 stroke stock block above5500 to 6000 due to strength issues. Same with power. Stay at about 650 hp and enjoy the torque.