Re: merc 5.7 260 carb rebuild?
Well actually yes I would have to say restoration will save a carb, if you have a carb that has had corrosion start to happen on the inside of the bowls where it leaves that white powdery residue, you can clean it but it will just keep comming back, the dichomate coating get everywhere inside passages and out, the parts go through a whole bunch of processes.
The cost of this service could cover buying a new though. I've had two carbs done, one was a Ford Galaxy 427 3x2 carb, the other is a Ford holley 427 4 bbl. Both vintage and irrrepalcable. The service was performed by Holley and was around 600.00 per carb. The triple deuce carb was so bad that inside the bowls were full of corrosion and had pitting, I'm sure I could have rebuilt the carb and made it work again but I wanted it restored.
As far as it performing any better I don't know, but the restoration does include flow testing.