Two entirely different starters. One won't work on the other application. The 14", 168 tooth flywheel uses a offset bolt hole nose piece. The 12-3/4", 153 tooth flywheel uses a straight across bolt pattern on the nose.
What size is your flexplate? This determines what starter you need.
It looks like you need to do some shimming.
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Mike
1985 Chevy C-10
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