biggest tire for my Valliant

Mopar Action's Green Brick ran the same 225/50VR15's My '88 ShelbyZ came with when it placed 3rd in the One Lap of America, and it's the size I have on My '64 GT on Popo Rallyes at the moment, they are low & some may not like the look.....but a little free gearing bump if You have a dog rear gear.:D...
Pics!!!