I agree with the above statement, my car is 440, lighter than yours and 12.5.1 comp. I still think my car would go 10.30's with 10.5.1. Put that in a heavy car like yours, easy 10.80-90.
I use an ultimate converter 5000 stall.
You may not do it first time out but once you've got it dialled in, 10's should be attainable, assuming the chassis is up to it.
Mick