I went a friend's place this weekend to check out his newly restored 330 GTC. It's a georgeous car and we went for a nice drive on the windy road in Bedford. Here're the problems: 1. The car back fired quite often. especially when it's cold. The Mechanic who told my buddy that this is normal. 2. I heard knocking...which I know is not normal and probably due to some loose ignition wires. I know the older Ferrari engine was designed for leaded gas, so my buddy did put some lead additives to the gas. I told him to stop driving the car until I check with F-Chat... Could anyone elaborate on this? The mechanic who did the restoration is Autotourismo Sport (Danbury, CT). I think John/Steve Masastraiani are the father/son owners.