So I have a Hi-Lift ASA cam in my LS1 5.7 engine with less then 12K on it.
I got a little hot with the nitrous resulting in detonation and said bye bye to the #4 piston.
So now I have a stock LS3 form an 2009 c6.
What do I need to do to use this cam in my new engine?

 

Are you running a stock pcm? If so, the cam is the least of your worries. The crank will be a much bigger issue.

 

OP- ^^^^^This^^^^^^
You need to deal with 24x vs 58x before worrying about the cam.
Priorities.....

 

I should have added that I already ordered the 58X-24X converter, the cam sensor extension, knock sensor relocation kit and MAP conversion adaptor.

But after some thought I decided to change it up a bit and go with the BTR Red Hot cam.
Should work out pretty good.