3000 rpms up the driveway? Why would you do that?
If you drive normal you cannot even tell its there. A 3000 rated will only footbrake test till 2200. Less in a 305. Dynamic converters make custom stalls. The one they built me is perfect. It even uses the GNX core, for that grand national type acceleration. I cant think of any driving condition it would negatively impact. Towing, I don't know? I towed 7500+ lbs on a wt distribution hitch. The trans was fine. At 65 Im at 2800rpm. Not terrible.
Every car today has at least 2400-2600 stall.
Again It will not even be noticeable. Until you use it. Consider it part of the basic muscle car package.