That's a common issue when putting a V8 or later 6 in the earlier truck. A shroud or electric fan would definitly halp in proper cooling, as the fan being so low without a sroud will not pull much air through the radiator.
On the temp gauge, you should be able to re-use the stock gauge. You'll need an adapter bushing (which I do not recall the Napa-Echelin number for) to allow the original temp sensor bulb to fit the hole in the engine. The gauge will work fine with the V8.


Bill Burmeister