I was kinda in the same boat here, but have heard that size fits (? backspacing though). I'm looking to put 18"s on, with a 275 50 or 60 tire on the back, 255 or so on the front. Whatever tire that fills the rear and looks good. Forgot yours is a 63, but I'm pretty sure yours is very close to a 64.
<font size=-1>[ This Message was edited by: 64GALAXIE514 on 7/19/06 10:01pm ]</font>
Waaayyyyy back when I had 10 inch slotted mags with 8 inch tires on them and they barely fit. With out air shocks they rubbed a little. Turned my white lettering to white walls. Wouldn't have taken much to alter the lip on the wheel well to clear it though. This is on my '64.
The 10" tires to match would never have fit. Unsure of backspacing and don't remember tire size. The 70s was just too long ago!