Exhaust manifold condition & porting - advice please!

[CerbWill]

I've just taken these manifolds off my car due to a small exhaust leak from between the flange and the cylinder head. I'm planning to use ACT's gaskets when I refit them however when I took them off I was surprised to see the state of them in the pics below. I think the finish looks quite poor and the large step change in cross section can't be good in my opinion, but I'm no expert. So, is this normal/acceptable or should I get the dremel out?

Cylinder 2


Cylinder 4


Cylinder 6


Cylinder 8



Cylinder 1


Cylinder 3


Cylinder 5


Cylinder 7