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Clois,
When I built my 428, I too had slow crank problems. I had -0- size cable, but I had to drill and tap the frame and add a ground strap from the frame to the outside starter to bellhousing bolt to get a good ground.
A simple way to check for connections that have high resistance is to attempt to crank the engine several times then quickly feel each connection by hand. If you feel a hot connection, that is where the problem is.
Also you can hook up a timing light and see where the timing is, it may be advanced so far that it is "fighting the starter" and preventing it from cranking at normal speed.
Keith
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