You can never have too many grounds. Ford has a bad habit of running a chassis ground to the radiator, which often becomes brittle. I personally recommend a two lead ground cable with a pigtail, and run one lead to the block and one to the frame, and the pigtail to whatever the factory chassis ground is. I also recommend running a separate ground cable from the block to the frame, and one to the firewall. Among other things, this also eliminates any rpm pitch you may hear through your stereo.
Take care,
-Chris
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