Wide tires + rain + daily driver = what traction
Even with relatively skinny tires most v8 powered A-bodies are pretty scary in the rain. I had 205/70 R14's on my 67 barracuda with a mildly built 340 , 727 auto and 3.23 sure grip 8.75 rear. It was always a handful (or even both hands frantically sawing the steering wheel) to keep it out of the ditches on wet roads!!
I would keep the tire width within reason and buy tires that provide excellent wet traction on any street driven A-body. You can always have a different set of wider tires for any trips to the racetrack.
JHMO,
Bob