If it was mine, I'd find a REPUTABLE cylinder head guy and have them checked out. Cast heads are heavier but they don't move around either or grow/shrink either. Since you got the rocker gear and a intake use them.
If they check out good and you have the stuff, it's worth it..But I'd have them flow tested. A ton of air at .700 lift isnt going to help on a street/strip enigne with a .550 cam.
