340 overheating problem

Sorry guys been busy for a bit. About the converter it's a 3800 stall. With a trans cooler. The water pump is fine. The cooling is getting better. Went to a couple shows over the week and every morning I woke up I checked the rad and its been down a couple inches. So I'm getting the air out. But today still got to around 215-220. It does stay cooler longer but once it gets hot, it stays hot. Now that I got all the air out it's over flowing. As far as the timing of the engine, since I got the new cam and the engine only has a couple hours on it, one of my engine builders techs came over to the house to help break it in and he set the timing. He supposedly good at what he does when it comes to dialing in a motor. We're not a 100% yet but I'm confident he knows what he's doing