Picture of 340/360 head porting....Mistakes?

Thanks to all.
The floor was the first thing that i fill in. just because it was the largest csa. trying to make the port equil in csa. what i found was that you can shrink the csa at the floor without changing anything in flow.(low fps air flow) but when you eliminated that swoop up to the ssr you were done. flow crash and didn't come back. I layed back the ssr until i found water there two.......then filled it back in with mud.
What i was trying to do was make the csa slowly get smaller all the way to the bowl/seat area.
What i learned was the SSR will NEVER let you do that.
So i tried to shrink the upper bowl/seat area to make it the mcsa. never got any good results from that idea.
As far as air speeds go i had 480+ fps on the ssr when i muddit up like the pic".

I have never considered anything then a 45* seat, on a Pcar head. heard stories about them beating the death out of seats and needing a special spring exc. Don't know nothing about that so never tried it.
From what i have learned on the combustion chamber side of things.....can see how it might help, if the rest of the port could be set to make it happy.
Also would help keeping the air from crashing into the vertical wall going up to the head surface.
This is one of the reason i think the clay, "closed chamber" work so well. Smooth radius all the way to the head gasket surface.
And when i did that swoop in the combustion chamber around the spark plug, i think it allowed more air to travel there and keep from backing up against the wall.
Does that make sence? Some time i have a hard time typing what i'm thinking