Thanks Greg, I am leaning towards that solution after listening to the various advice.
We have that convertor behind our 70 Charger and are very pleased with it (a stock one).

The 446 in the Dodge has a purple 484 in it which although we are pleased with the performance,
465 HP, six pack, 10.25 CR, it is a very rough and tumble low RPM engine because of all
the overlap on that cam.

I think the 505 will have better low RPM manners and with that amount of torque
and 99% street driving, I think we'll do OK with an 11" that has good innards and a plate.

Thanks all, and I'm still listening...….

Joe