As of ACYM Starter 8.7.3, it is not possible to edit out (or in) Joomla Article blocks by hand, or at least we haven+t found a way to do it.
There are many situations in which we want ti be able to edit any portion of a Joomla Article block prior to sending out the email.
Intro texts frequently have plugin commands that but be eliminated manually.
We understand that the content is taken as-is from Joomla articles, but there must be a way to edit it at will.