That would be an 0-300- that has re-worked cases, re-worked rocker arms, reworked Rods, reworked crank, used push rods, every thing else would be new. cam, lifter assemblies, bearings, cylinders assemblies, gears, and accessories. with the added up grades ECI cylinders with exhaust valve rotators, oil filter.
Then IF , IF you run it LOP at all power setting at all altitudes, change oil at 25 hours, use Phillips 20W50 you will get as close as you can.
And Please, do not replace the old carb with a new style. the old metal float with a 2 piece venturi, and old style atomizer nozzle will run at 6.5-7.5 gallons per hour (LOP), and not foul plugs and combustion chambers. The new style will run 8-9 gallons per hour, and foul plugs like crazy.