An oval port head would be a nice upgrade, but you could also clean up the ports on the existing head, add the the reground cam to the bottom end and pick up a cheap 32/36 weber while you're sourcing all the goodies for an oval port head.....................you'd get a nice power boost while being able to take your time on the rest of a build up. Personally unless your like myself or a couple of other guys who race a particular class that requires us to use the A12, I'd just build a nice A14.

Tom