New 360 375 HP with Stock 727 trans

I run a Turbo Action 10" S800 converter in my street/strip car and very happy with it. IMO it was the best bang for the buck $600, for my combo performance. Shifts like grandma's car driving normal, tire shredding with the pedal down. My Magnum 360 is around 400HP high 11, low 12 car.
Paul Forte at Turbo Action is great and will not BS you.
Run what you have if money is tight and save up for a good converter to wake up your combo.