It could be as simple as battery cables needing cleaning at both ends, and of a good size, e.g., AWG 2 or better.
New engine will be tight to turn when hot. Starter may be dragging, battery may not be large enough.
Use A DMM and measure across bat terminals while cranking, if less than 10 volts, then its either low battery, dragging starter. Borrow a battery and check again.
Or too much initial base timing.
Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
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CUBS - 2016 World Series Champions - maybe this year, 2019 ...