Anyone run 215/70/14 on 14 x 5.5 rims

Anyone run 215/70/14 on all four 14 x 5.5 rims on thier '66 Barracuda? Looking for a new set and want to go a little taller than the 195/70/14 on now. Any idea how much of a speedo change I could expect?... Looking to get a set of Firestone Indy 500.

Thx, ZooKypr