Is a 1 row rad enough

[1968CHEVYC10]

I've got a stock 75 350 in my 68, the radiator has a few holes in it so I got a new one at oreilly's, According to their website is was a 3 row, but when I brought it home turns out it's only a 1 row. There's currently not a thermostat in the engine, but I was planning on getting one after I installed the rad what temp range should I get? The radiator I have in the truck now is 2" thick, I'm not sure exactly how to count the rows but the new one is only 1 1/4". Anyway I live in southeast Tx and out summers are usually upper 90's to lower 100's. I wont be doing much driving in heavy traffic but I might be doing some light towing. Thanks for the help yall!