Help with building a bit more power in to the 318

So what kind of power could you expect if I ran it the with the above tweaks? Ofcourse the water problem is beeing taken care of, that's the whole reason for tearing it down. Sure but according to those "400 horse 318" articles. One of them were using 302 heads, wich of course have smaller chambers and so on, would I be better of with a pair of 302's with 360" size valves and porting?