I did the same thing to a 427 FE head. Lots of work for little gain.
I don't think the mod on a Cleveland would be worth 100 hp, 30-35 maybe........
You also might want to look at putting the Cleveland heads on a Windsor block, it takes some water mods but in the end it's a better block and has more racing/performance parts available for it. Like the dry sump mounting, previously mentioned distributor, etc...