With the dieseling issues, it sounds like carb issues to me too.These look more like carb issues than tq converter issues to me.
I have to ask, what carb are you running, and are you running ported vacuum or vacuum from under the throttle blades?
Reason I ask is I was running ported vacuum and 93 octane gas, switched to ethanol free 90 octane and my engine dieseled terribly. Running 18 degrees initial timing with ported vacuum was likely keeping the combustion chambers too hot, causing the 90 octane to detonate where the 93 didn’t.
Switched to manifold vacuum and my timing came up to around 22 degrees initial (my junk summit balancer has it’s timing marks rusted off) and the dieseling problem went away- even with a 1k rpm idle.