and at looking at 17 & 18" tires for classic muscle cars, for them to look proportional you need about 27" tall for larger cars like B & E bodies.

BF Goodrich KDWS's in 255/50R17 are a good size, as is a 255/45R18...they are a WIDE 255, actually closer to a 265 width, $189 from tire rack...they are Z rated (back when I bought them in '03 they were W rated), $189 ea

lots of options in the 255/45R18 size for under $175 ea on tire rack, and in the 275/40R18 & 285/40R18 sizes for under $200 ea...