Mancini racing and year one both have kits that have the freeze plugs and oil galley plugs in them. The year one kit also has the oil filter plate and "bolt" to hold it in also. I don't have the part numbers handy at this time.
The Year One "hardware kit" is part # P5249261 and is the most complete. It has all oil galley plugs, water jacket cup plugs, and oil filter mounting plate and center "screw" for it.