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You really need to define "new converters". Most converters are built with off the shelf parts that work at an acceptable level for lower hp. The answer id give otherwise on the examples you gave is simply too much for a car looking to maximize performance. The only converters ive seen that had acceptable slip for drag racing with 10 sec or faster power imo are all custom converters such as the 9.5" PTC, ATI, and Bradco. The price typically reflects the performance. The PTC i had in my black car slipped about 3.5% @140mph. I have not seen a 10" that will meet the needs of 10 sec power without excessive slip and a 12" would be for a nearly stock car and likely slip a bunch with any power if it stalled to 2800.
If your going to go 11.50 you only need about 115mph. Id go 3.55 and a 28" measured tire. Not locking it throws the nice chart you just posted completely out of the question. Plan on crossing the traps at at least 5400 if you arent locking it. For 10% just add that percent to the mph for each gear/tire combo. You will likely be over 10% slip though. The less numerical gear you run at the same power the higher the slip% will be at all ranges throughout the quarter. I doubt you will ever be able to hit 120mph in the quarter without locking the converter unless you go with ported heads which will work the converter even harder up top. You should really consider a nice 9.5" PTC for that heavy car with minimal top end work done to the engine. Trying to run high boost with stock heads and small cam equals a lot of work for the converter. Slip % will be very high unless you are locking at WOT or run a good NL.
