MY STORY: Took out the 350 SBC 4/sp in my '77 GMC C25 and rebuilt a 454 BBC/TH400 from a '74 identical donor truck headed for the boneyard and put it in. I installed "The Best" Dual Fan/Dual Relay set up cuz I also installed the Vintage Air System (which I love). Ran like a raped ape, and...