I have a picture of a cross section sport head on my phone. Will try and load it up if I remeber. When I asked about porting in the members only section I didn't get a huge response. All I have done is bored through the exhaust ports at 22mm and 25mm down the inlet ports, the aim was then to remove guides and blend it in.
1973 Imp in need of restoration (one day it will get there!)
1978 Opel Kadett C