The suggestion to remove the timing belt was on the assumption that something is binding. (You said it was hard to turn by hand.) Without the belt only the crank would be turned and the idler and cam wouldn't be there to offer resistance.
Your first post indicates you replaced the starter. If the symptoms remained the same with the replacement starter, I doubted that the starter was the problem. Rather a bad connection to it.
However, maybe you were given a starter which draws excess current which the truck battery can handle. So see if you can get a replacement starter.
Your profile doesn't indicate where you live, but if it is near Brampton, Ont, I have spare starters.
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1980 245 Canadian B21A with SU carb but electronic ignition and M46 trans in Brampton, Ont.
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