I'd suggest a set of Aluminum Heads if the wallet can stand it..

If you're concerned over finding a head to match one of the existing, then you'll probably need / want to at least investigate the condition of both heads... you're going to lay out some cash anyway.. the alloy heads won't be so expensive when compared apples to apples.

Something to consider..

OH, and welcome to the club. It's good to see you here!