340 stroker help?

OK I learned that the pistons were originally supposed to make like 12:1 comp, and the cam is specs: .549/.549, 252/252 duration @ .050, 112 lsa. 308 deg adv duration. It has 70cc iron heads w/ 90" head gaskets. The initial timing was @ 30 deg at 3000 rpm. If I put anymore into it it pings even on race fuel. I think im gonna pull it and tear it down to look further. I was hopeing to change to aluminum heads and differnt cam so I did nt have to tear bottom end apart but not sure at this point. TKS Guys