On my 66 Hemi it’s run to ported as that is all I have - no other ports on the manifold or carbs to connect to.
I was running manifold vacuum advance off of an 800 Edelbrock AFB-type carb on my 67 GTX. But, I had a correct 67 Carter AFB 4327 restored and I installed it last spring and again hooked it up to manifold advance. I do this by “T” into the choke pull off vacuum hose which comes off a low port on the right side.
I have a long history with a BB 66 Corvette and the Corvette forums. In the Corvette and the Chevy world in general, few people consider running ported vacuum advance - virtually everyone converts over to manifold to help engine cooling and street performance - in contradiction to the Mopar world. Mopar guys in general remain in favor of ported advance to a considerable degree. But I remain a proponent to manifold vacuum advance when possible for the engine cooling, it smooths out the idle, and it seems to help throttle response off idle. Both systems help fuel economy on the highway but who keeps track of their mpg in these things anyway.
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