This is something to look into, however disconnect your battery before trying this. There are two wires on the starter, a fat one and a skinny one, the fat one leads directly to the + on the battery, and if you short that to ground with the battery connected, it will be a rather shocking lesson. The skinny wire is from the relay, it's what causes the starter to engage and start the car. The skinny wire on the starter might not be making good contact on the starter. I had that happen on my 74 super 2 years ago, I just disconnected the wire and squeezed the connector "just a bit" with pliers so when I reconnected it, the wire had a good connection/wouldn't fall off. I haven't had a starting problem since then.
Ps. the muir book is a good read, even just to read it, the way it's written actually makes it faciniating.
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