Head and cam selection help for 440

I dont know because no one will answer how much better these would flow than the 452, neither one ported. Normally anytime i bring up porting the irons everyone says dont do it because ootb aluminums will outflow a mid ways port job on irons, but i dont know if this is true, thats why im asking the pros here..Its hard for me to come up with anything. I mean if i have 2000.00 set aside for heads alone, weather it be a new set, or port work, i need to know how close a set of ootb aluminums would be to a set of irons with 2000 worth of port work? Thats the thing, i dont know.. As i said earlier, i 'hear' people say the ootb aluminums outperform stocks with no work by a good bit but i dont even know if thats true,,thats why im here..