The main thing that i am worried about is the cruising at 55 mph and 2900 rpm. If the stall is above 2900 arnt you going to get slippage while running at 55 mph and cause heat?
Are you aware of: the countless posters here that have had the same concerns as you? And of the countless posters through the years who have tried to enlighten them based on experience? Set that worry aside.
Ask yourself, why so worried? What’s that worry based on? The last car you had with a loose converter? What you’ve read? Someone’s told you? The key word is “Tight” when it comes to a converter.
What’s the highest stall car you’ve driven or ridden in? One with a tight converter?
Once you’ve driven/ridden in a car with a tight higher stall converter you wouldn’t have worries or concerns. Positively 100%
That’s all I got. Hopefully other will jump in.
