Hey.. I'm rebuilding my 400. I have edelbrock 72cc aluminum heads that I don't want to spend the money to replace, and I'm buying a new rotating assembly anyway, so I have two options for bore and pistons if I want to run 93 octane pump gas. Option 1: Bore it to .060 over making it a 412 CI and use flat top pistons. Option 2: Bore it to a 461 and use dish pistons. The cost is almost the same to do either. Which will give me better performance? I've read that dish pistons don't have very efficient combustion so I'm not sure what makes the most sense to do.