Over $6000 to install TTI headers on 66 Barracuda

Seems like you're doing the right thing James. Having been "in the business" in garages, a dealership, and behind parts counters - I certainly think he should know better than t odo work exceeding the authorization without getting written clearance to do so. Ultimately that's the rub. He could spend everywaking minute on it, but if you signed up for $1K, it's up to him to communicate the issues PRIOR to incuring the labor cost. I've been on both sides of that fence and the best way to work it out is to work with him on it. As for what I'd do - I'd have it towed out and give him $1000 in cash, because either a hobbyist, or another shop will be less money than whatever middle ground you find between his completion cost and $1000.