Alright, I have the engine now, paid $100 for it. Sweet deal of the century for me! This engine was bought as a crate engine for someone and installed. The problem was that they couldn't get it to stop pinging on regular pump gas. So, the owner wanted a new engine put in under warranty. GM said ok and now the old engine (with 177 psi of compression) became a core, and the core charge was $100. This engine has 200 miles on it. I'm wondering if running a carb and premium in it will be fine, or are there thicker head gaskets available? I'd like to have the compression ratio come down a bit. This engine is going into the Pig, in front of a SM465/NP205 combo. Thoughts? Anyone know what route to take?