A body 73 and up vs 72 and older front track width questions.

This is the difference in the track from the 67-72 cars to the 73-76 cars- 57.74" for 67-72 and 59.15" for 73-76. That is track width so it does include the wheel specs

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The difference is in the spindle/brakes and possibly some in the wheel specs, but it's not in the K frame, UCA's, LCA's etc. Using the later FMJ spindles (that came with the transverse torsion bars) results in the same track width change on a 67-76 A body as the 73+ A body spindles (same brakes).

Barracuda's do not have the lower fender corner to frame braces like Darts, Dusters, Demons, etc., although you can add about 2" of push with those rods without really doing anything bodywork-wise.

The '67-69 Barracuda's have the most restrictive fender openings of pretty much all the 67-76 A's, and a 26" tall tire in the front is a stretch regardless of the spindle/brakes used. This is even more true with lowered cars, as ride height makes a big difference. The OP's car is most decidedly lower than stock, so that's part of the issue too.

What are the specs on those back to the 80's convo pro's? Width and backspace? And what size are the tires?
The Wilwood brake kit for the 72 and older spec to have zero offset but they have 3 different kits, the tires are 26x6.0015LT Mickey Thompson, the rims if I remember correctly are 4" or 4.5 with zero offset. I paid a good buck for these because they were in very nice condition, you can't buy them off the shelf anymore. I will be cool when they make a comeback like torque thrust wheels did, they just seem to be the look I like for this car, not really into the pro touring look. With the Willwoods and older spindles I should be Aok, I drove the car to a few places but I have to be very careful when articulating the suspension and turning. Very nice diagram for the track width BTW.