I did the swap and it looks like youve got most of it. The LS3 injectors will only be at 75 - 85% duty cycle with that combination. One thing I wish I would have done was motor mounts when the heads were off. Biggest thing to get the most out of the combo is get a good 5-angle valve job on the intake and a continuous radius on the exhaust along with the decking 0.030". Definitely invest the $12 in the pushrod checker to make sure you get the right length. As for the cam specs, I think you can go bigger. What about fly-cutting the pistons?