New converter

hey guys building a 408 for my Aspen. Comp ratio is around 11.47:1, 3.91 rear gears, 904 trans with shift kit and rev man VB, 275/50r15 rear tire and may run a small shot of spray. Currently I have a Huges 27-25HD converter which worked great on my mild 318 but... so I did call a few shops but they all seem to want to push me onto their shelf units. My cam im using recommends at least a 2800 stall. Any opinions?