New Build Advice Needed

300hp seems to be the magic number everyone wants to hit naturally aspirated. A lot think they have, but in reality it's pretty tough. Not impossible, but damned tough.

I have my "next motor" on the stand. 198 long rods, 2.2 4cyl pistons, factory closed chamber prototype head with 318 valves. Block has been decked to .010" in the hole, so there'll be plenty of quench. I'm not trying to hit a certain number, I'm just building a solid, strong slant 6.

However, if I were trying to hit the number, I think I would back up and use a cast crank engine. Much lighter rotating mass. Cast cranks will stand 500hp, so plenty of room there. Probably not happen now, as I'm too far into this one, but that's what I'd do if I was looking for numbers. Which I'm not. I'm lookin for fun.