When I was googling a couple weeks ago I stumbled on a guy moving the exhaust ports to be more like the type I
Just be careful about hogging them out to get flow....less flow at a higher velocity usually makes more hp. 150cfm@28 only needs a 26 or maybe 27mm valve and may 23mm min area (seat or guide)...that is WAY south of a 36mm valve. Big valves expose more seat area faster so they can be a help but big slow ports don't help. You can see the effect of slow ports by increasing the min area, that doesn't change flow but it usually makes a pretty big difference in predicted output....it also tend to move the peak torque rpm higher so you get a peakier engine.
What the right intake/exhaust ratio is I don't know. It kind of seems like the higher the VE number you're after the higher the exhaust flow you need. I see flow numbers on high reving 4v stuff at 85% and my engine at like 77% because that's all the exhaust flow I could get needs more duration on the exhaust. But a buddy of mine used to swear by 65%...but he flowed with the pipes in place so I suspect the stack numbers would have been more like 75%...just a guess.....and this is the value of dynomation. It will help get everything matched.
One thing to really watch as you get into the final details is that the valve size in the engine setup matched the valve size in the head flow....the software will scale the port flow in the head file when you change the valve in the engine setup. This is really helpful to quickly check stuff like % I/E ratio to see what works best, but you have to remember to get the 2 matched back up and matching reality.