Did a bit more last night; namely sectioning the head to understand exactly what shape the intake port has and to help understand where the lumps and bumps are.
After the final cut (bang on the deck to seperate!):
It's amazing the difference between how it looks and how it feels with your finger; even on the ports which are still intact there's a marked step at the valve seat interface both on the short side and far side.
What's clearly visible is the throat of the intake port, which to be honest I thought would be closer to the valve, though perhaps rather un-ideally it's almost a bloody right angle - am sure the charge loves that!
Managed to successfully blend the valve seat/head interface all around the valve (no pics) as well as smooth out the short side radius 'steps', though am stumped as to how to whittle down the valve guide support casting as I can't get near it with my current tooling.
Any ideas? Tony?!
Lastly I took a silicone mould of one of the un-touched ports as while I hope I'm be making them visibly better it's always nice to have a record of where you started:
Cheerss,
Matt