Cusser
+1y
Above lies the key: get a 2-row radiator, was designed for use in the automatic trucks, so has inlet outlet at the bottom for ATF that you just don't use. That's what I have on mine here in Arizona (190F thermostat too or you won't get decent winter heat).
When I developed too-high heat with my original 1-row radiator, i bought a copper/brass 2-row radiator that bolted right in to my '88 B2200, cooled great, but developed a small leak at a weld after one year. It was lifetime warranty, the replacement was an aluminum 2-row that bolted fine into the truck but I did have to drill holes in its bracket for the fan shroud (see my engine rebuild thread below for pictures).
So 2-row radiator is key. If your stock fan clutch and fan blade are OK, use those. If you don't have those or want to try for a few more hp, then you should consider an electric fan set-up.