Cooling Issue - 1964 Dart GT - 273 with automatic and A/C

I just cruised through 41 posts here and I think I missed where your are having overheating issues. How hot does it get? Factory gauge (just a guess there) Is it puking coolant out?
Factory gauge. Not puking coolant, but the temp gauge quickly creeps up to the line just before 'H', at which point I find a way to get moving or shut it down.