I've always liked BFG TAs but they are not that great of a performance tire
as many others. However, most performance tires are not available in a 15
inch diameter in the sizes we need.  What I most liked was that they were a
fabric belted radial and could sustain higher speeds than most steel radials
due to less mass of the belts. However, with speed ratings, you can safely
pick a high speed steel belted radial now.  And BFG only rates them as 110
mph I think. I've had them MUCH higher and had no problems ever due to
speed. I have separated belts in others due to speed, and luckily never had
one come apart while driving.

The original size was a GR70-15 but that type of sizing is long gone. The
basic equivalent is 225/70R15.  To get a more aggressive stance, and more
grip, a 60 series tire should be used. The 255/60R15 became an option in
1978, but the '78 had a rear body that was about an inch wider than '74-'77
and the factory trimmed the inner fender on cars receiving the 255/60 tire.

The best size in a 60 series is the 245/60R15, but not everyone makes that
size. The 235/60R15 is much more common.

Some 255/60R15s will rub on the emergency brake cable and cut the tire with
the steel Rally wheels.  The aluminum factory wheels have a slight bit more
offset and will clear. The bracket moved about a 1/4 inch in either '78 or
'79.  Aftermarket wheels need to be checked with tires.

Many tires will rub at the front.  Usually they rub on the frame when at
full lock on turning. This doesn't affect anything, but some will rub the
inner fender or the back of the fender. This can crack fiberglass, so you
need to check.

Unfortunately, for a mass-produced car, nearly every one fits the chassis
differently and so some will fit while others won't. A BFG TA on a Rally may
fit on half of the cars fine and rub on the other half.  So you really need
to mount a tire and wheel and try them on every corner.

I appreciate everyone's replies, my biggest concern is the amount of space
between the tire and wheel well, I've seen many cars where the tire doesn't
'fill' the wheel well and it looks horrible. I do like the way the 225/70
fit now, but wonder if going to a 235 or maybe 245/60 would widen the stance
and still 'fill' the wheel well?

I have narrowed my two tire choices to either the T/A or the Yokohama Avid
S/T, does anyone have any feedback on the Yokohama?