Large valved 273

roccodart440 said
I wonder if it would be better to...

Port the head

Open the smaller valve farther

Open the smaller valve longer

Again, the other option here is to procharger it. There are bolt on kits to do it. Not a bad option...

What's the goal. 400hp, port the heads and the right cam will do it. You're on the right track there.
All out? Bigger valves in those are a ton more work. I would do what I could to avoid the notch...but its inevitable perhaps at a certain point.