67 dart fan ??

Just finishing up my 273 to 340 swap. Last thing I need to deal with is the fan shroud and fan. It still has the stock 4 blade fan and no shroud. I see they don't list a shroud for a 67 dart so what shroud would work? A 325 or a 614? Read a lot of the aftermarket ones have had problems. Anyone better then the other? And where to buy? Also looking at the mopar Viscous fan kit.(part number 4120758). Will this work with the stock radiator? Thanks any help would be great!!