If you have a 67, I would recommend the factory traction bars that came on the car. They look great when restored correctly but the drawback is they fetch $400 plus a pair.

CalTracs will be the best aftermarket alternative if you didn't want to go factory.

If a 68 and have traction issues, I would first address age of springs and shock type first and if need replacing, do so. As Mark stated above, the 68 staggered shocks and addition of leafs cured most traction issues. However, worn springs and shocks can exacerbate wheel hop and traction, so address that.

Competition Engineering Slide A link traction bars. I believe those are around $400 pair.

Both Caltrac and Slide A Link are direct bolt ins.

Hands down, I'd get Caltracs...beefier..