Thanks guys for the quick replys!
I would define "beef up" as being modified to handle the 500 hp 498 tq my small block stroker pumps out.
I think I will go with a truck 727 as suggested, and use the savings difference to buy a torque conv w abt 23 to 2500 stall.
I'm not going to race this car, but it will see some full throttle runs!