A factory type setup, fan, clutch and shroud will do the job. Yes you'd probably need a new alt along with relays to power the fans and temp sensors to turn them on and off.
Not sure what fan was stock on a 69 big block. 70's used a GM xxxxx772, don't have the full GM # handy but everyone refers to them as 772's. Along with a Hayden hd clutch and stock shroud will keep your engine running cool if the rad, water pump, etc are all good.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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