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I'm biased because I have a 4v, but if you're building it into an older car, use the stuff that we know works. Build a 4v, find a T56, and put a power adder on it and you have one mean machine. If you're looking to be a little different, build a 5.4 4v. There aren't many out there ( because it's a pain in the butt to round up all of the right parts ), but they're dang cool and fast.