Can a Winsor Block have Romeo Heads?

Yep. There are subtle differences. Like you would need new valve covers and possibly a different pcv setup depending on the oil fill. But otherwise all you'd need is the usual head swap parts. cam gears are different I think tho too.
 
They won't prevent you from doing it as long as you have the right parts.

I agree with evolucion though, it'd be much more simple to stick with Windsor heads and there are zero gains swapping to Romeos.
 
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