Thanks Bob, I am planning on 215/70s on a 15 x 7 Rallye style. The will be slightly narrower and taller than what I have.

Whiplash there is a fellow from Auckland, Mark Barton, that hangs around at the 2doorpost.com forum. He has a '66 L72 Biscayne, maybe that's the one. He also has a 63 Ford 300 with a 427. He likes the big sedans with big power!