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Another thing...

A lot of aftermarket and custom wiring harnesses as well as undersized alternators aren't up to the task of handling the high amp fan(s) needed to cool a hot FE. I'm running the Taurus 2 speed fan/shroud on mine and it needs 40 amps to keep it running. I've run #8 wire for the fan circuit, fused at 50 amps. I was getting 10.5 volts to the running fan with 12.5 volts from the alternator using the "fan circuit" in my Painless Wiring harness.

BTW... I went with Griffin's "800 hp" radiator, twin 1 1/2" tubes. It made a big difference over my old Griffin with the twin 1 1/4" tubes.