There are at least 2 build sticky's at everything-honda.com for built F23A's both are using 8.5:1 custom pistons so they are likely as close to off the shelf as you can find. I think most of the piston companies will make you piston provided you have are willing to wait a few weeks to months for them.

As for rods I think most folks use a Crower H23 rod for the F series block.