I picked up a used hydroboost unit out of a mid 90's Chevy Astro van. Master cylinder is a new unit, for a late '70's Corvette. The adapter that mounts the h/b unit to the firewall is a U-weld kit from a seller on ebay.
I'm going to make my own stainless braided teflon lined hoses, and use Aeroquip steel fittings.