Summit racing does not list any direct replacements.
You can purchase a re-manufactured long block, build your own or purchase built block and transfer your accessories, intake, etc.
Going with a "built" bottom end (forged rods, pistons and crank) really serves no purpose unless you plan on some serious mods. You can stick with rebuilt stock bottom end and put your money into head work for an increase in hp.
If you can find a "built" lightning motor (complete w/ supercharger set up) it would probably be your best option as far as cost vs hp and bolt right in.