440 Source Head Opinions?

I'm running heads we built in the 80s, both 452s and 915s on a 060 over 440 and a 060 over 4.15 crank 500 cid 440, both have had a couple valve jobs, both have had there complete valvtrain replaced, that's valves, springs, retainers and keepers. The 915s on the 500 got 2.18 intake 1.81s valves and I finally put a set of Harlen Sharp rocker assemblies on them. Now all these parts would need replacement if they were on aluminum heads also so I don't see how cast iron is a wash as far as cost goes you can pick up a set of 915s for a 100 bucks or less. I do my own port work, a buddy does the valve grind and assembly, I guess I'm not buying aluminum heads because I like all the bone heads telling me I'm wasting my money on cast iron and making 650 hp with them. If I were to go aluminum it would be Trick flows but then my crankshaft would be holding on for dear life.
I don't know but it not worth arguing about to each his own...
I will add camshafts involve a little trickery with duration and cam C/L to have the power where you want it.