Hey there, so I rebuilt this 1978 302 and dropped it in with 351 heads and a 650 holley. Got it timed to the mark (6BTC) Here's the thing. It overheats like crazy. past 230 easy. I pulled the heads off this morning just to make sure I put the head gaskets on correctly which they were. I put on a different waterpump which I am sure works, I even pulled the thermostat, Just for the summer (gets hot in the city sitting in traffic) But I still cant figure out what the heck is going on. I even have the heater going and that does nothing. I'm using the same water pump that was on my 351, which was new when I tore that engine down. I even threw on a 10,000 rpm rated 17 inch flex fan. Now the only thing I can think of is the radiator. This came out of an eliminator that my friend sold a few years ago, doesnt leak or anything, but I dont want to drop another 200 bucks on a radiator unless I know thats what it is. Is there a certain way to fill the radiator or something on these older cars. I dont know, but any suggestions would be greatly appreciated being this is the only thing that is stopping me from ripping up the asphault in brooklyn. Thanks