All that epoxy is concerning to me. The stuff has the nasty habit of not staying were you put it and winding up in the cylinders.
In the days of racing Clevelands, that was less of a problem since the race engines got torn down frequently, sometimes between drag races and internal conditions verified.
The top racers like Nicholson and Glidden were their own engine builders and no longer guessed at which was the safest or most effective way to de-port intakes and heads.
Glidden is the one that was experimenting with reshaping the combustion chambers to increase combustion efficiency and you can see those now on heads like the "Blue Thunder" aftermarket heads.
On a "street car" I'm not sure that epoxy in the ports is the safest way to go? I certainly wouldn't. Even the cast "port stuffers" need to be "pinned" and even that can fail.
It goes back to the adage of, "you'ze pays your moneys and you'ze takes your chances". In the case of epoxy'd ports, I don't like the results of the risk analysis findings. Others have varying perspectives.