mini starter install

Hello everyone. My 73 swinger won't start, barley cranks a few times before it gives up. My dad, an old Mopar guy, says sounds like the starter. I bought a smaller starter from a Dakota at a wrecking yard in preparation for header install. However upon installation, it sat crooked against what was a metal tab by the corner of the oil pan. Are there starters that work around this or does it have to be removed?