Single or double?

So is the issue that the pre 70 V8's had the intake hose on the other side of the engine? Can I just take my /6 radiator to shop and have a core added or beefed up in some other way?
yeah, sort of. it's all interchangeable but with the change over the waterpump outlet moved along with the timing marks on the timing and the lower radiator outlet. so if you run the wrong combo of parts you either can't see the timing marks or you have to jog the lower radiator hose from one side to the other directly under the fan.

you could take the rad to a shop and have them add a core to make it 3 and move the upper inlet to a "more correct" location. dead center isn't great because of possible interference with the fan and if it's in the "correct-ish" location you can run a stock hose that fits nice and looks good!

depending on the cost of adding a core and moving the pipe, i'd maybe look toward an aluminum aftermarket solution.

I have a Cadillac motor in my 50 chevy pickup and I have an ugly routing of the lower hose... These darn radiator hose issues seem to be following me.
time to break the cycle amigo!

parts of a molded hose and some solid tube can make for a much cleaner and solid install. here's a vast selection of them: Coolant Tubes - Free Shipping on Orders Over $109 at Summit Racing