I wouldn't push the boost too hard with stock pistons. Even the LT1's only can handle 6 psi before things start coming out in pieces....And they were meant to be abused....
I would look seriously into o-ringing the block or heads. A big limit is going to be the stock head gaskets, no performance once available. Even the 301 Turbo V8's got o-ringed gaskets..... and I blew 2 sets of them....But I beat the Mustang both times.....
