aluminium head questions

Lets forget cost for the time being. I'd really like a set of Indy heads but as far as I know, they don't make a set w/ straight plugs. Is there a closed chamber set of heads w/ straight plugs?

Going from my 452's to the MP's would only bump up my CR to 9.8 or so. I'd like to get to 10.5. Any other options?