Help on rebuilding a 73 340

Thanks that was my plan to open it up and take a look inside first the guy I bought it from said it ran fin he was just replacing it with a 440. But when its sitting on a pallet it is sort hard to tell. He seemed like a very honest guy but I have been fooled before. I But if I understand you the TC thats in there will work fine with the 340 and not end up with a vibration problem. I can afford to buy another cam if need be but its not like I entend to race it but I do want to put my best foot forward to start with. So if I understand you I will need to match the converter to the cam?