engine still not cool enough

My radiator is a 22" 2 row. Can't remember the name. BUt I bought it at Advance Auto Parts. My '70 340 has about 15000 miles from a previous vehicle I had it in. It is standard bore with factory 10.5:1 forged pistons, .480 lift cam, airgap intake. Before I put it in my 67 Dart I pulled all the freeze plugs. The block cooling passages were super clean.