I rum 17x8's with 235/45 front 245/45 rear on my 66. I'm lowered about 1.5" all around. I run Kumho ECSTA 712's. They are great tires and a great price(about $100 each through tirerack.com). Try tirerack.com, you can search different manufacturers and tires and check out they're specs.
Also, just a helpful tip: Polish the rims and get them CLEAR powder coated. They will come sparkling clean with just washing. No polishing every other day.
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347 (Coast High short block), 279/284, TFS TW heads, Stealth, 750 Holley, Flowtech hdrs, Dr. Gas X, 2 Chmbr Flowmaster, MSD 6AL-Dist.& SS coil, March serpentine pulley system, Art Carr C-4 (Soon to be a Richmond 6 spd), Currie 9" w/3.50, alum Drv Shft, susp mods, Total Control subframes & tower braces, Trans Am Racing power dual master, 4 wheel disc, 17x8 Torqthrust II's
Something up my sleeve
In a 66 coupe