another overheating post, 68 302, usually runs halfway on the gauge(stock). last week it just jumped up to right aqll the way. didnt boil over. had some problems over the years(owned for 20years) . but sorted them out. this has me stumped. first off i changed stat, 195. checked the gauge grounded the wire, pegged needle, have an old cluster, wired up that gauge and warmed up the engine and needle run up same as the cars did. radiator is ten years old, three row, very clean.water pump is stock, 12 years old. i do have afr 165 heads on. no smoke out the pipes. car runs well.this just happened at once. bought an cheep thermal gun and had 206 in the upper tank and hose lower hose was much cooler. unless the water pum p is making noise or leaking i see no reason to change it out. complete overhaul of engine 12 years ago, block was cleaned out. trying not to overthink this but i thought i would try everything i know before posting this. any ideas? get a mechanical; gauge to see hot how hot its getting? i dont know.