I first want to disclaim I am only 17 years old and am still learning a lot about cars. However, to the subject at hand, my dad has told me countless times one day I will inherit his 1969 400 Firebird. The car has had many issues regarding overheating and he has about given up, but I refuse to let it sit in the garage without at least trying. I have been with him or have been told about all the things he has tried including everything thermostat related(it has a 180 right now). The engine at idle jumps to around 225 after sitting 10min and while driving it gets to 250 but doesn't boil over even with the heater on(you can hear the engine tick). He even put an aluminium radiator from giffenrad.com and paid a little much for it. It has a new MSD distributor and the car shuts down at times for what is highly likely that the coil gets cooked because it's not heat protcted. I was even told at times the rubber pieces behind the water pump not being installed may be a cause but they are. My dad seems to think it may be over bored but I doubt it can cause the car to heat up as fast as it is. If you need any pictures I can take a galley when I get home but of I get a list together of suggestions it can really help. Thanks!