I dunno, I bought one of the reproduction shrouds for my '66, and had to heavily modify it to fit. I'm running a 350 on factory mounts with a long water pump, factory fan, and fan clutch. The radiator is a heavy-duty "Desert Cooler" down flow model by US Radiator. The truck came with a six, but I ordered the radiator for the V8 when I did the swap.
I think the extra thickness of the aftermarket radiator might have something to do with the problems I experienced, as I had to remove about 1" of depth, but I also had problems with the shroud sitting at the wrong height on the radiator (fan would hit the bottom of the opening). Got it all together after lots of trial fitting and cutting/grinding though...
