Head porters attn advice needed

Ok basically I scored a set of Indy 440-1 heads and decided to build w new power plant of my valiant. Im building a 500 cid low deck storker motor topped with the indy heads and indy 400 4150 intake.
My plans are to convert the intake over to efi im in the process of sourcing the parts now and if any member has any leads on diy parts id much appreciate ive looked all over the net and from what I can find its slim pickings.
But im about to dissemble the heads and I going to gasket match the heads and intake and when I was looking the heads over I noticed some casting flash in the heads I planned to clean up and polish.
While I have the heads on the bench what areas should I pay most attention to other then the casting flash? Wheres the hidden power in these heads?
Ill post up some pics later this week of the heads after I dissemble them. Any and all help is always appreciated
Aaron