I agree with Gavin, with the unknown history of the carbs, even if you tried installing them yourself, who knows what headaches you might get during the install; and as well all get the nasty surprises along the way. Most times it ends up costing you double than getting it done by professionals. Broken / missing manifold studs are standard so unless you know how to tackle those, a drive in, drive out thing might be the best and stress free for you.