Vizard Manifold Mods?

Any you guys done the Vizard mods to the SU log manifold??

While I've got the head being machined, I thought I'd take a flyer.
But the cross-sections of the ports on my '72 log look different than
the ones in Vizard's book (surprise). My ports are longer (deeper?),
making it very difficult to get a tool in to round the edges.

What have you guys tried (successfully)?

chuck (chuckc@attglobal.net)