I ended up not needing the fan spacer. The radiator I used is an aluminum 2 row designed for a chopped 32. $170 on ebay. I mounted digital guages, speedometer and tach in the space between the top of the radiator and the grill shell. The fan is a 16 inch flex fan and I made a shroud from sheet metal although I don't think I need it. I use a 75/25 water to antifreeze. The truck runs very cool even in 110 degree temps. The guage will go up to 220 sitting ideling for awhile. I discarded the t-stat as it didn't seem to do anything. Everything is working great now. Fingers crossed.