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Lots needs to take out, I have a customer that has one of my heads in his Mk2 escort, ST170 engine making 230bhp on standard inlet manifold.
Yep done one, there is room for improvement. You just get many people tuning these engines to that level whee head work is needed.
The one I tested was a eBay one. No gains from that. I ported one and got a few more cfms.... Well a total of 5. Not a lot and not a lot would show up on the road. I will port inlets if people want them but I say save the money and get the head done instead.
Cost of a inlet doing is £150-£200...
My ported heads are £400, I don't do exchange sorry so you would need to send me a spare or your own..
Power wise on a standard engine I'm not sure as most people that get head work done have other modifications.
Phase1er had one of my heads to give you a idea.