Re: slow cranking when hot
The little starter support clips are available. It just bolts to one of the starter bolts and the other to the pan rail. I'm not as familiar with the old 21 stud set ups but most of the early fords I've come across have them. They were misplaced by previous owners a lot.
If your ignition distributor advance unit is sticking, it could be holding it advanced which could slow the start process. If you turn the starter with ignition off, it should turn normally since it can't try to kick back with the ignition off. If that test has no effect then something else has high resistance and is causing an excessive current draw. Checks for heat in the conductor cables have already been mentioned. A weak battery can get hot if the generator is working overtime trying to keep it charged.
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