/6 running hot - what are your temperatures?

I poked a lb of crap out of my 67 when I had the freeze plugs out. Open the rad and start the cold motor and watch the coolant flow. if its a stat issue, youll either see no flow (until it opens) or youll see flow off the bat which is not good either unless the bypass is showing you a little ancillary flow. Id check the pump again, rebuilt stuff is hit or miss sometimes. Does it run well outside the temperature issues? Valves adjusted .010/.020? Here is an online reference for an Aussie Slant but all the specs are legit, 'cept the Bosch distributor!
Chrysler 225 Slant 6 Engine Rebuild Manual : Free Download, Borrow, and Streaming : Internet Archive