I think that it's going to depend on what you plan to do with the engine.For example;if you're looking for power,as in 500 plus,then no,go big port,even though it's more expensive.If you're shooting for a slightly better than 1 hp.per inch,say 450-460 real horsepower,then the 333's would be a good option.New aluminum heads,in "off the shelf "trim are going to set you back about 24-2500 dollars.Core 583's or 690's will normally cost you at least half that,plus the cost of the machine work plus the needed parts,such as valves,guides,seals,springs,studs,ect.A set of 333's that come in at a total cost of 12-1500 dollars is not at all a bad deal.Tom,if you're going to do a tribute to Ronnie using those 333's,then said engine MUST be a 409,not some,as you put it a "Jr.Varsity" 348.