Coker has some radial that look like bias, but you'd never run them on a muscle car.  
Sammy is right, these bias tires were good enough for years.  I bet today's reproduction tires are better than they were back then.  I'm not sure why there seems to be so much apprehension.  
A wheel and tire change can really transform a car attitude.  When I see cars running period tires and mag wheels- there is a real transformation in my mind.  I find I'm not the only one who responds to those great looking square footprints.  I think you'll enjoy the bias tires more than you realize.
Here is one of my favorite Nova's rocking a great upsized tire selection.  Somehow these Nova's look great with 14 or 15" wheels.  
 
