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Some things to ponder.
- It starts fine when boosted
- It turns over very slow with the new battery
- It is hard to turn over by hand
So your truck battery (stronger?) will start it, but the car one doesn't? Like jfj0jfh, I'm thinking the starter is fine but something is binding. Try disconnecting the alt and power steering belts to see if it turns over easier. Or if you don't mind resetting the timing, go further and remove the timing belt.
A bad ground should show up with the truck battery also, but to check, use a booster cable from the -ve post to the block near the starter, thus bypassing the other ground connections.
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1980 245 Canadian B21A with SU carb but electronic ignition and M46 trans in Brampton, Ont.
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