5.3 to 383 stroker

[comicaltatertot]

So I didn't know where to post this and I hope that this is right place, I am just looking for some help. I have a 2005 GMC Sierra with a 5.3 it is an L33 so it as the aluminum block and 799 heads. I am just lookin to do something different than everyone else. So when doing some reading I ran across truckin who did a 5.3 and turned it into a 383 stroker.
Doing some more research I found the kit from probe industries has a 4" crank, 6.2" H beam rods and pistons for a 3.902 bore.
My question is do you think this would be a reliable engine after it has been bored out and clearanced? I am looking for about 500hp
Also on 799 heads would they support up to 500hp? I know they would need a valve spring upgrade. Or would it be safer to send them out to like TEA to get them done?
Anywho any help on this would be great. Thanks