David Vizard, Uncle Tony's garage, Unity motorsport. Mission impossible Dodge 302 Head porting

I can see from this picture that the closed chamber heads have the shrouding problem of ALL small chamber heads!
I have a set of 1965 273 heads that also look the same around the back of the valves.

I bet when David Vizard sees them just like BMC mini heads he has a flashback to the sixties and Harry Weslake...