So I noticed on Saturday that the alignment I've been putting off till I can afford wheels and tires has eaten the inside of my passenger front tire down to the belts, so the GT Bird is stored for the winter now until I can afford tires.
I have 3.73:1 gears, and the car was rolling on 255/50/16's when I got it from Traveler. Tires were worn due to overinflation, so I knew this was coming. Speedo reads perfectly according to my GPS, timing a mile, and the police "Your Speed Is" signs. Anyway, the only tires I can find in 255/50/16 are BFG Sport Comp 2's, which look like a good tire, but even though I only use the car in the summer I have trouble buying a 300 treadwear tire. I've had good luck with General Altimax AS-03's on my 1999 Mustang GT, great treadwear, great traction in rain and dry, and although I haven't used them in snow, would I be caught in snow they supposedly would work ok, so I found some in 255/40/18.
I went ahead and ordered these, http://www.ebay.com/itm/Set-of-4-Whe...143979?vxp=mtr
According to this website, the tire will be close enough (off by .1" height, .3mph at 60), and the wheels with the 35mm backspace will clear my suspension and only be silghtly further out than the stock wheels, which tend to tuck in somewhat.