Mild 318 engine build advice

I'd be careful with KB and the closed chamber heads you might end up with too much CR your probably looking for 9:1-9.5:1 CR, stock valved 273/318 heads will flow enough for 300-325hp with 268+ cam, I wouldn't go bigger valves unless your gonna open the bowls up for the larger valves, but if your willing to do a performance 3 angle valve job and a little porting you'll hit 350hp.