[Jack21]

Tom,

Kinda figured that would be PA's take on this. A heavy duty, but otherwise stock converter would be what you'd want to use.

Still not sure you're going to be overly happy with 12" SNS with this combo. Behind a tweaked 351 Cleveland, this would be ideal for the street.

You're putting a 521ci, tame (650 fptq @ 2500RPM), big block in a 2400# car and driving it on the street. You've got a bottom end - mid range torque monster that's going to be a handfull just keeping the wheels from breaking loose. A higher than stock stall speed converter will only make this worse. A heavy duty, but stock, or even an RV converter, and low rear gears, 2.74 - 2.88 or so, should get better traction, less wheelspin, and use the engines' torque where it's making torque. Since the car is so light, and you're not winding the motor, a bone stock OEM converter for a Galaxie or Lincoln would work and be inexpensive. Let the PA guys rework the valve body in your C6 for Street Rod use. A street rod valve body is typically used in big block-light car applications. The trans changes gears faster, but the engagement is softer so it doesn't chirp the tires and snap your neck under light load.

And, since the trans isn't slipping much, you don't have to cool the trans fluid much.