I think the stock heads and automatic will make it a lot more driveable, Mike! I can imagine what a posi is like down there on the roads when it does rain, had a similar experience many years ago when Jackie decided she wanted to drive my Maverick (408, 4 spd, posi) once in awhile--til one of the days she drove it too work and it was a light rain when she left and 180'd the car pulling away from a stop sign at her usual brisk pace!!!!!!! She went back to driving her Caprice to work after that!