Tony and Tomguy,
you are saying I'd run into trouble with these milled heads anyway in terms of geometries?
So the claim is that the original head cc-s at 52.5cc. Mine has 46cc.
this means a 1mm cut.
This would require a cut of the intake manifold of the same amount each side. Is it standard procedure to cut both head and manifold?

This comes on top of the trouble with the power loss through reducing Compression rate from 9.5 to 8.5.

I am really lost.

Would you try and find a local shop to repair the existing heads? Or would you install these 117 heads?
Best, Martin