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It's almost impossible to over do it with cables

Make sure you have a decent cable from there to the starter as well...Ford always scrimped on those..

I would add the ground cable first..That might be all you need. I have had to run a ground cable all they way up in some instances but I wouldn't do that if I didn't have to..Bigger cable never...

It could easily be that simple..If it still turns slow have someone else crank it while you feel the cables for excess heat.. Any weak link or connection will get hot..It takes a lot of amperage to...

That one will get ya every time.. I had a 460 once that was lighting the spring on the throttle cable up like a toaster element because of no ground cable to the body

WHat do you have for Hot and ground cables???